Marek Vasut [Mon, 19 Sep 2022 19:19:23 +0000 (21:19 +0200)]
usb: Add missing guard around env_get() in usb_hub
The env_get() might be undefined in case ENV_SUPPORT is disabled,
which may happen e.g. in SPL. Add missing ifdef guard around the
env_get() to prevent build failure.
Signed-off-by: Marek Vasut <marex@denx.de> Tested-by: Fabio Estevam <festevam@denx.de>
Tom Rini [Mon, 10 Oct 2022 12:17:08 +0000 (08:17 -0400)]
Merge tag 'u-boot-nand-20221009' of https://source.denx.de/u-boot/custodians/u-boot-nand-flash
- mtd: Update the function name to 'rfree'
- Support NAND ONFI EDO mode for imx8mn architecture
- dm: clk: add missing stub when CONFIG_CLK is deactivated
Fabio Estevam [Fri, 7 Oct 2022 14:35:53 +0000 (11:35 -0300)]
mtd: Update the function name to 'rfree'
Since commit 8d38a8459b0d ("mtd: Rename free() to rfree()")
the function has been renamed to rfree(), so update the description
inside the mtd_oob_region structure as well.
Roger Quadros [Wed, 28 Sep 2022 11:42:35 +0000 (14:42 +0300)]
mtd: nand: Fix SPL build after migration of CONFIG_SYS_NAND_SELF_INIT to Kconfig
This fixes the below build error if nand.c is included in
an SPL build.
/work/u-boot/drivers/mtd/nand/raw/nand.c: In function ‘nand_init_chip’:
/work/u-boot/drivers/mtd/nand/raw/nand.c:82:28: error: ‘nand_chip’ undeclared (first use in this function)
82 | struct nand_chip *nand = &nand_chip[i];
| ^~~~~~~~~
/work/u-boot/drivers/mtd/nand/raw/nand.c:82:28: note: each undeclared identifier is reported only once for each function it appears in
/work/u-boot/drivers/mtd/nand/raw/nand.c:84:20: error: ‘base_address’ undeclared (first use in this function); did you mean ‘base_addr’?
84 | ulong base_addr = base_address[i];
| ^~~~~~~~~~~~
| base_addr
Fixes: 068c41f1cc77 ("Finish conversion CONFIG_SYS_NAND_SELF_INIT to Kconfig") Signed-off-by: Roger Quadros <rogerq@kernel.org> Reviewed-by: Michael Trimarchi <michael@amarulasolutions.com> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Tom Rini [Fri, 7 Oct 2022 15:25:05 +0000 (11:25 -0400)]
Merge branch '2022-10-07-riscv-toolchain-update'
- Update RISC-V to use 32bit or 64bit toolchains, depending on if we're
building for 32bit or 64bit CPUs. This requires updating the Docker
container as well to have the 32bit toolchain.
- Assorted platform updates for developerbox, armv8 platforms in
general, TI K3 and AM65 platforms, nuvoton NPCM845 SoC and then clock
driver, ftgpio010 support, and common/board_f cleanups.
Alexandre Ghiti [Mon, 3 Oct 2022 16:07:54 +0000 (18:07 +0200)]
riscv: Fix build against binutils 2.38
The following description is copied from the equivalent patch for the
Linux Kernel proposed by Aurelien Jarno:
>From version 2.38, binutils default to ISA spec version 20191213. This
means that the csr read/write (csrr*/csrw*) instructions and fence.i
instruction has separated from the `I` extension, become two standalone
extensions: Zicsr and Zifencei. As the kernel uses those instruction,
this causes the following build failure:
Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Christian Stewart <christian@paral.in> Reviewed-by: Rick Chen <rick@andestech.com>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Rick Chen <rick@andestech.com>
For building riscv32 targets we should use the riscv32 toolchain.
Add it to the Docker image.
Drop the riscv toolchain-alias as we do not need it in future.
While in here, update to the latest "jammy" tag.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Rick Chen <rick@andestech.com>
[trini: Update to latest jammy tag] Signed-off-by: Tom Rini <trini@konsulko.com>
Ravi Gunasekaran [Thu, 22 Sep 2022 09:51:23 +0000 (15:21 +0530)]
net: ti: cpsw-mdio: Add workaround for errata i2329
In certain TI SoCs, on the CPSW and ICSS peripherals, there is
a possibility that the MDIO interface returns corrupt data on
MDIO reads or writes incorrect data on MDIO writes. There is also
a possibility for the MDIO interface to become unavailable until
the next peripheral reset.
The workaround is to configure the MDIO in manual mode and disable the
MDIO state machine and emulate the MDIO protocol by reading and writing
appropriate fields in MDIO_MANUAL_IF_REG register of the MDIO controller
to manipulate the MDIO clock and data pins.
More details about the errata i2329 and the workaround is available in:
https://www.ti.com/lit/er/sprz487a/sprz487a.pdf
Add implementation to disable MDIO state machine, configure MDIO in manual
mode and provide software MDIO read and writes via MDIO bitbanging. Allow
the MDIO to be initialized based on the need for manual mode.
Signed-off-by: Ravi Gunasekaran <r-gunasekaran@ti.com> Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
Include linux/sizes.h because it defines SZ_64K which is used in many
places inside k3-udma.c
This fixes the error: ‘SZ_64K’ undeclared which appears during build
time
Signed-off-by: Dhruva Gole <d-gole@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
In order to move ppc-specific code out of setup_dest_addr(), provide an
arch-specific variant arch_setup_dest_addr(), that can be used by
architecture code to fix up the initial reloc address.
It is called at the end of setup_dest_addr() initcall and the default
implementation is a nop stub.
Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Ovidiu Panait <ovpanait@gmail.com>
common/board_f: remove XTRN_DECLARE_GLOBAL_DATA_PTR dead code
The XTRN_DECLARE_GLOBAL_DATA_PTR declarations in ppc code are permanently
commented out, so there are no users for this macro:
#if 1
#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r2")
#else /* We could use plain global data, but the resulting code is bigger */
#define XTRN_DECLARE_GLOBAL_DATA_PTR extern
#define DECLARE_GLOBAL_DATA_PTR XTRN_DECLARE_GLOBAL_DATA_PTR \
gd_t *gd
#endif
Remove all references to this macro, but add a documentation note regarding
the possibility of using plain global data for the GD pointer.
Signed-off-by: Ovidiu Panait <ovpanait@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@konsulko.com>
cmd: replace efi_create_handle/add_protocol with InstallMultipleProtocol
In general handles should only be deleted if the last remaining protocol
is removed. Instead of explicitly calling
efi_create_handle -> efi_add_protocol -> efi_delete_handle which blindly
removes all protocols from a handle before removing it, use
InstallMultiple/UninstallMultiple which adheres to the EFI spec and only
deletes a handle if there are no additional protocols present
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
efi_loader: define internal implementations of install/uninstallmultiple
A following patch is cleaning up the core EFI code trying to remove
sequences of efi_create_handle, efi_add_protocol.
Although this works fine there's a problem with the latter since it is
usually combined with efi_delete_handle() which blindly removes all
protocols on a handle and deletes the handle. We should try to adhere to
the EFI spec which only deletes a handle if the last instance of a protocol
has been removed. Another problem is that efi_delete_handle() never checks
for opened protocols, but the EFI spec defines that the caller is
responsible for ensuring that there are no references to a protocol
interface that is going to be removed.
So let's fix this by replacing all callsites of
efi_create_handle(), efi_add_protocol() , efi_delete_handle() with
Install/UninstallMultipleProtocol.
In order to do that redefine functions that can be used by the U-Boot
proper internally and add '_ext' variants that will be used from the
EFI API
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Move the registration of events for the addition and removal of block
devices to the block device driver. Here we can add a reference to the
EFI Driver Binding protocol as context.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
For handling added and removed block devices we need to register events
which has to be done when the driver is installed.
This patch only creates an empty init function that will be filled with
code later on. The function needs to be called before any EFI block devices
are used. Move the efi_driver_init() call to early init.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
efi_driver: provide driver binding protocol to bind function
DisconnectController() is based on the open protocol information created
when the driver opens a protocol with BY_CHILD_CONTROLLER or BY_DRIVER.
To create an open protocol information it is required to supply the handle
of the driver as agent handle. This information is available as field
DriverBindingHandle in the driver binding protocol.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Currently we have subcommands 'efidebug dh' which shows protocols per
handle and 'efidebug devices' which shows the device path. None shows which
U-Boot device matches the handle.
Change 'efidebug dh' to show the device path and the U-Boot device if any
is associated with the handle.
efi_loader: efi_dp_part_node check dp_alloc return value
dp_alloc() may return NULL. This needs to be caught.
Fixes: 98d48bdf415e ("efi_loader: provide a function to create a partition node") Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
On the 32bit ARM sandbox 'dm ut dm_test_devm_regmap' fails with an abort.
This is due to incorrect range checks.
On 32-bit systems the size of size_t and int is both 32 bit. The expression
(offset + val_len) is bound to overflow if offset == -1. Add an overflow
check.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Simon Glass <sjg@chromium.org>
arm: mvebu: turris_omnia: Specify VHV gpio for eFUSE programming
VHV gpio is connected to MCU and only on updated board design. Without it
eFUSE programming does not work. Omnia MCU driver exports this GPIO to
U-Boot under name mcu_56 and only when it is supported by MCU. So U-Boot
fuse command refuse eFUSE programming on older board design when VHV gpio
is not available.
We tested that Armada 385 without connected VHV gpio can do eFUSE
programming but only for some bits and only sometimes - it is unstable.
And better to be disabled on older board design without VHV gpio support.
arm: mvebu: Add support for specifying VHV_Enable GPIO
VHV_Enable GPIO is required to enable during eFuse programming on Armada
SoCs not from 3700 family. Add support for enabling and disabling VHV pin
via GPIO during eFuse programming, when specified.
All details are in Marvell AN-389: ARMADA VHV Power document
(Doc. No. MV-S302545-00 Rev. C, August 2, 2016).
Note that due to HW Errata 3.6 eFuse erroneous burning (Ref #: HWE-3718342)
VHV power must be disabled while core voltage is off to prevent erroneous
eFuse programming.
This is specified in Marvell ARMADA 380/385/388 Functional Errata,
Guidelines, and Restrictions document
(Doc. No. MV-S501377-00 Rev. D, December 1, 2016).
arm: mvebu: Add support for programming LD0 and LD1 eFuse
This patch implements LD eFuse programming support. Armada 385 contains two
LD eFuse lines, each is 256 bit long with one additional lock bit. LD 0
line is mapped to U-Boot fuse bank 64 and LD 1 line to fuse bank 65. U-Boot
32-bit fuse words 0-8 are mapped to LD eFuse line bits 0-255. U-Boot fuse
word 9 is mapped to LD eFuse line lock bit.
So to program LD 1 General Purpose Data line, use U-Boot fuse command:
Stefan Roese [Wed, 21 Sep 2022 06:26:42 +0000 (08:26 +0200)]
timer: orion-timer: Only init timer once
Move the code making sure that the timer is initialized only once into
orion_timer_init(), which is called from timer_early_init() and from
orion_timer_probe(). This way the timer is not re-initialized.
Signed-off-by: Stefan Roese <sr@denx.de> Cc: Michael Walle <michael@walle.cc> Cc: Pali Rohár <pali@kernel.org>
Stefan Roese [Wed, 21 Sep 2022 06:26:41 +0000 (08:26 +0200)]
arm: mvebu: Remove timer.c
Since the move to CONFIG_TIMER with support for CONFIG_TIMER_EARLY, this
platform specific init_timer() function is not needed any more. Let's
remove it completely.
Signed-off-by: Stefan Roese <sr@denx.de> Cc: Michael Walle <michael@walle.cc> Cc: Pali Rohár <pali@kernel.org>
Replace the if/else chain in pxa_ecc_init() with a lookup table. This
makes the code more concise and hopefully easier to follow. Remove the
unused ecc_layout tables and replace it with a single dummy one (the
pxa3xx driver has never used this but the mtd subsystem expects it to be
provided).
Tested on an Allied Telesis x530 switch with Micron MT29F2G08ABAEAWP
NAND Flash.
Signed-off-by: Chris Packham <judge.packham@gmail.com>
Fabio Estevam [Mon, 3 Oct 2022 14:02:03 +0000 (11:02 -0300)]
imx8mn-ddr4-evk-u-boot: Fix broken boot
When the imx8mn.dtsi file was pulled in from Linux, the UARTs
were moved into an spba sub-node which wasn't being included
in the SPL device tree. This meant the references to the UART
weren't being handled properly and when booting the system would
constantly reboot. Fix this by adding the spba node to the spl
device tree to restore normal booting.
Based on the patch from Adam Ford for the imx8mn-beacon-kit-u-boot
board.
Fixes: 4e5114daf9eb ("imx8mn: synchronise device tree with linux") Signed-off-by: Fabio Estevam <festevam@denx.de>
Fabio Estevam [Mon, 3 Oct 2022 14:01:15 +0000 (11:01 -0300)]
imx8mn-venice-u-boot: Fix broken boot
When the imx8mn.dtsi file was pulled in from Linux, the UARTs
were moved into an spba sub-node which wasn't being included
in the SPL device tree. This meant the references to the UART
weren't being handled properly and when booting the system would
constantly reboot. Fix this by adding the spba node to the spl
device tree to restore normal booting.
Based on the patch from Adam Ford for the imx8mn-beacon-kit-u-boot
board.
Fixes: 4e5114daf9eb ("imx8mn: synchronise device tree with linux") Signed-off-by: Fabio Estevam <festevam@denx.de>
Tom Rini [Fri, 30 Sep 2022 19:52:10 +0000 (15:52 -0400)]
Merge branch '2022-09-29-dm-core-support-multiple-device-trees-in-ofnode' into next
To quote the author:
At present the ofnode interface is somewhat limited, in that it cannot
access the device tree provided by the OS, only the one used by U-Boot
itself (assuming these are separate). This prevents using ofnode functions
to handle device tree fixups, i.e. ft_board_setup() and the like.
The ofnode interface was introduced to allow a consistent API to access
the device tree, whether a flat tree or a live tree (OF_LIVE) is in use.
With the flat tree, adding nodes and properties at the start of the tree
(as often happens when writing to the /chosen node) requires copying a
lot of data for each operation. With live tree, such operations are
quite a bit faster, since there is no memory copying required. This has to
be weighed against the required memory allocation with OF_LIVE, as well
as the cost of unflattening and flattening the device tree which U-Boot
is running.
This series enables support for access to multiple device trees with the
ofnode interface. This is already available to some extent with OF_LIVE,
but some of the ofnode functions need changes to allow the tree to be
specified.
The mechanism works by using the top 1-4 bits of the device tree offset.
The sign bit is not affected, since negative values must be supported.
With this implemented, it becomes possible to use the ofnode interface
to do device tree fixups. The only current user is the EVT_FT_FIXUP
event.
This has two main benefits:
- ofnode can now be used everywhere, in preference to the libfdt calls
- live tree can eventually be used everywhere, with potential speed
improvements when larger number of fixups are used
This series is only a step along the way. Firstly, while it is possible
to access the 'fix-up' tree using OF_LIVE, most of the fixup functions use
flat tree directly, rather than the ofnode interface. These need to be
updated. Also the tree must be flattened again before it is passed to the
OS. This is not currently implemented.
With OFNODE_MULTI_TREE disabled this has almost no effect on code size:
around 4 bytes if EVENT is enabled, 0 if not. With the feature enabled,
the increase is around 700 bytes, e.g. on venice2:
$ buildman -b ofn2a venice2 -sS --step 0
Summary of 2 commits for 1 boards (1 thread, 64 jobs per thread)
01: image: Drop some other #ifdefs in image-board.c
arm: w+ venice2
48: wip
arm: (for 1/1 boards) all +668.0 text +668.0
This size increase is not too bad, considering the extra functionality,
but is too large to enable everywhere. So for now this features needs to
be opt-in only, based on EVENT.
Simon Glass [Wed, 7 Sep 2022 02:27:32 +0000 (20:27 -0600)]
dm: core: Allow copying ofnode property data when writing
At present ofnode_write_prop() is inconsistent between livetree and
flattree, in that livetree requires the caller to ensure the property
value is stable (e.g. in rodata or allocated) but flattree does not, since
it makes a copy.
This makes the API call a bit painful to use, since the caller must do
different things depending on OF_LIVE.
Add a new 'copy' argument which tells the function to make a copy if
needed. Add some tests to cover this behaviour.
Simon Glass [Wed, 7 Sep 2022 02:27:30 +0000 (20:27 -0600)]
dm: core: Expand ofnode tests
The current tests do not cover all functions, nor do they cover the new
multi-tree functionality. Add and update the tests accordingly and update
the 'future work' notes in the documentation.
There is a still more testing needed for the failure cases, since at
present some ofnode functions return a libfdt error code instead of
converting it to an errno.
Simon Glass [Wed, 7 Sep 2022 02:27:28 +0000 (20:27 -0600)]
dm: core: Update comments for default-FDT ofnode functions
Some ofnode functions can only operate on the default device tree, i.e.
U-Boot's control FDT. Add comments to that effect. Fix up the reference to
device tree bindings while we are here.
Simon Glass [Wed, 7 Sep 2022 02:27:27 +0000 (20:27 -0600)]
dm: core: Complete phandle implementation using the other FDT
We need to be able to look up phandles in any FDT, not just the control
FDT. Use the 'other' FDT to test this, with a helper function which gets
this as an oftree that can then we used as needed.
Add a few more tests and some comments at the top of the file, to explain
what is going on.
Simon Glass [Wed, 7 Sep 2022 02:27:26 +0000 (20:27 -0600)]
dm: core: Add the ofnode multi-tree implementation
Add the logic to redirect requests for the device tree through a function
which can look up the tree ID. This works by using the top bits of
ofnode.of_offset to encode a tree.
It is assumed that there will only be a few device trees used at runtime,
typically the control FDT (always tree ID 0) and possibly a separate FDT
to be passed the OS.
The maximum number of device trees supported at runtime is 8, with this
implementation. That would use bits 30:28 of the node-offset value,
meaning that the positive offset range is limited to bits 27:0, versus
30:1 with this feature disabled. That still allows a device tree of up
to 256MB, which should be enough for most FITs. Larger ones can be
supported by using external data with the FIT, or by enabling OF_LIVE.
Update the documentation a little and fix up the comment for
ofnode_valid().
Simon Glass [Wed, 7 Sep 2022 02:27:25 +0000 (20:27 -0600)]
dm: core: Add definitions for multiple ofnode trees
At present, unless OF_LIVE is enabled, ofnode only supports access to one
device tree, the control FDT. This is because only the node offset is
encoded in ofnode, with the tree being implicit.
This makes ofnode (without OF_LIVE) unsuitable for device tree fixups, as
implemented by ft_board_setup() and other such functions.
To solve this, we can use the top bits of the node offset to hold a tree
ID.
Simon Glass [Wed, 7 Sep 2022 02:27:24 +0000 (20:27 -0600)]
dm: core: Split ofnode_path_root() into two functions
This function turns out to be a little confusing since it looks up a path
and also registers the tree. Split it into two, one that gets the root
node and one that looks up a path, so the purpose is clear.
Registering the tree will happen in a function to be added in a later
patch, called oftree_from_fdt().
Simon Glass [Wed, 7 Sep 2022 02:27:23 +0000 (20:27 -0600)]
dm: core: Allow obtaining a node offset in the same tree
In some cases we want to obtain an ofnode in the same tree as a different
ofnode, such as when looking up a subnode. At present this is trivial,
since there is only one tree. When there are multiple trees, this
implementation will change.
Also move the ofnode_to_offset() function up higher in the header file,
since we will need to provide a different implementation with multiple
trees.
Simon Glass [Wed, 7 Sep 2022 02:27:22 +0000 (20:27 -0600)]
dm: core: Add a way to look up a phandle in an oftree
When we have multiple trees, the ofnode logic needs to be told which one
to use. Create a new function which takes an oftree argument, along with
a helper to obtain the FDT pointer from an oftree.
Simon Glass [Wed, 7 Sep 2022 02:27:20 +0000 (20:27 -0600)]
dm: core: Add an ofnode function to obtain the flat tree
The flat device tree is assumed to be the control FDT but this is not
always the case. Update the ofnode implementation to obtain the node via
an function call so we can eventually add support for selecting different
trees.
Simon Glass [Wed, 7 Sep 2022 02:27:19 +0000 (20:27 -0600)]
dm: core: Provide a way to reset the device tree
At present there is only one device tree used by the ofnode functions,
except for some esoteric use of live tree. In preparation for supporting
more than one, add a way to reset the list of device trees.
Simon Glass [Wed, 7 Sep 2022 02:27:18 +0000 (20:27 -0600)]
dm: core: Expand integer-reading tests
The current tests do not cover all the behaviour. Add some more.
Tidy up a few inconsistencies between livetree and flattree which come to
light with these tests. Also drop the -ENODATA error since it is never
actually returned.
Simon Glass [Wed, 7 Sep 2022 02:27:15 +0000 (20:27 -0600)]
dm: core: Avoid creating a name property when unflattening
The current implementation creates a 'name' value for every node. This
is not needed for the latest device tree format, which includes a name in
the node header.
Adjust the code to point the name at the node header instead.
Also simplify ofnode_get_name(), now that we can rely on it to set the
name correctly. Update the comment to make it clear what name the root
node has.
Simon Glass [Wed, 7 Sep 2022 02:27:11 +0000 (20:27 -0600)]
sandbox: test: Provide an easy way to use the other FDT
Add a test flag which indicates that the 'other' FDT should be set up
ready for use. Handle this by copying in the FDT, unflattening it for
livetree tests. Free the structures when the tests have run.
We cannot use the other FDT unless we are using live tree or
OFNODE_MULTI_TREE is enabled, since only one tree is supported by the
ofnode interface in that case. Add this condition into
ut_run_test_live_flat() and update the comments.
Simon Glass [Wed, 7 Sep 2022 02:27:10 +0000 (20:27 -0600)]
sandbox: Support setting up the other FDT for testing
Provide a way to copy over the 'other' FDT when running tests. This loads
it and allocates memory for the copy, if not done already, then does the
copy.
Avoid using U-Boot's malloc() pool for these copies, at least for now,
since they are part of the test system.
Simon Glass [Wed, 7 Sep 2022 02:27:07 +0000 (20:27 -0600)]
test: Drop the UT_TESTF_LIVE_OR_FLAT flag
This was a workaround for a rare situation. Now that it will be more
common and we have a proper fix, drop the flag. We can run both types of
tests in the same sandbox executable, even if the flat device tree is
modified.
Simon Glass [Wed, 7 Sep 2022 02:27:05 +0000 (20:27 -0600)]
test: Make a copy of the device tree before running a test
When the flat device tree changes it can mess up the live tree since that
uses the flat tree for its strings. This affects only a few sandbox tests
which modify the device tree, but the number will grow as ofnode support
for writing improves.
While the control FDT is not intended to change while U-Boot is running,
some tests do so. For example, the ofnode interface only supports
modifying properties in the control FDT, so tests must use that.
To solve this problem, keep a copy of the FDT and restore it as needed
when the test is finished. The copy only happens on sandbox (except SPL
builds), to reduce memory usage and because these tests are not useful on
other boards. For other boards, a checksum is taken to ensure that nothing
changes.
It would be possible to always checksum the FDT on sandbox and only
restore it if needed, but this is slightly slower than restoring it every
time, at least with crc8.
Move the code which checks for success to the very end, for clarity.
projects / u-boot.git / log
