Simon Glass [Thu, 6 Feb 2020 16:54:57 +0000 (09:54 -0700)]
dm: irq: Add support for interrupt controller types
There can be different types of interrupt controllers in a system and some
drivers may need to distinguish between these. In general this can be
handled using the device tree by adding the interrupt information to
device nodes.
However on x86 devices we have interrupt controllers which are not tied
to any particular device and not really used in U-Boot. These still need
to be inited, so a convenient method is to give each controller a type
and allow a particular controller type to be probed.
Add support for this in sandbox along with a test.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: remove the new bland line at EOF of test/dm/irq.c] Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Thu, 6 Feb 2020 16:54:55 +0000 (09:54 -0700)]
x86: apl: Drop the I2C config in FSP-S
This config is not actually used here and in U-Boot it seems better to set
this using the device tree for each individual controller. The monolithic
config of the FSP-S is only necessary if the FSP is actually configuring
something, but here it is not.
The FSP-S does enable/disable the various I2C ports. It might be nice to
handle this using the okay/disabled property of each port, but that can be
considered later.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Thu, 6 Feb 2020 16:54:53 +0000 (09:54 -0700)]
x86: Add a clock driver for Intel devices
So far we have avoided adding a clock driver for Intel devices. But the
Designware I2C driver needs a different clock (133MHz) on Intel devices
than on others (166MHz). Add a simple driver that provides this
information.
This driver can be expanded later as needed.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Thu, 6 Feb 2020 16:54:50 +0000 (09:54 -0700)]
dm: core: Add a function to find a device by drvdata
It is sometimes useful to find a device in a uclass using only its driver
data. The driver data often indicates the 'subtype' of the device, e,g,
via its compatible string.
Add a function to handle this.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Thu, 6 Feb 2020 16:54:49 +0000 (09:54 -0700)]
dm: core: Allow iterating devices without uclass_get()
At present we have uclass_foreach_dev() which requires that uclass_get()
be called beforehand to find the uclass. This is good if we suspect that
that function might fail, but often we know that the uclass is available.
Add a new helper which does this uclass_get() automatically, so that only
the uclass ID is needed.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
video: enable VIDEO_ANSI and all VIDEO_BBP options
This partially reverts changes by commit 2cc393f32fd9
("video: make BPP and ANSI configs optional") since it
caused issues with other boards (missing LCD console
output on pinebook, x86 platform or sandbox). Enable
all disabled options again and opt out of not supported
color depth in board defconfigs.
Tom Rini [Wed, 5 Feb 2020 12:18:12 +0000 (07:18 -0500)]
Merge tag 'rpi-next-2020.04' of https://gitlab.denx.de/u-boot/custodians/u-boot-raspberrypi
- DFU support file operations lager then the default max size
- add dfu support to dwc2 for bcm2835
- enable DFU for RPi4
- Fix RPi4 memory map to include the genet device
- add driver for the genet ethernet device
- enable network support in RPi4 config
- Various minor fixes for x86
- Switch to ACPI mode on Intel edison
- Support run-time configuration for NS16550 driver
- Update coreboot and slimbootloader serial drivers to use NS16550
run-time configuration
- ICH SPI driver fixes to hardware sequencing erase case
- Move ITSS from Apollo Lake to a more generic location
- Intel GPIO driver bug fixes
- Move to vs2017-win2016 platform build host for Azure pipelines
Alison Wang [Tue, 21 Jan 2020 07:33:01 +0000 (07:33 +0000)]
configs: ls1021a: Reserve low memory for CMA
The default reserved memory for CMA is high memory. If LPAE is enabled,
highmem pages are non-remapped and can not be used with
dma_alloc_coherent. This patch will reserve low memory for CMA and fix
the issue on LS1021A.
Signed-off-by: Peng Ma <peng.ma@nxp.com> Signed-off-by: Shengzhou Liu <Shengzhou.Liu@nxp.com> Signed-off-by: Alison Wang <alison.wang@nxp.com> Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
Biwen Li [Tue, 31 Dec 2019 07:33:38 +0000 (15:33 +0800)]
armv8: fsl-layerscape: spl: fix build error when DM_I2C is enabled
Fix below SPL build error when DM_I2C is enabled,
- arch/arm/cpu/armv8/built-in.o: In function `board_init_f:
arch/arm/cpu/armv8/fsl-layerscape/spl.c:74: undefined reference to `i2c_init_all'
arch/arm/cpu/armv8/fsl-layerscape/spl.c:74:(.text.board_init_f+0x30):
relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol
`i2c_init_all'
make[2]: *** [spl/u-boot-spl] Error 1
make[1]: *** [spl/u-boot-spl] Error 2
make: *** [sub-make] Error 2
arch/arm/cpu/armv8/fsl-layerscape/spl.c: In function 'board_init_f':
arch/arm/cpu/armv8/fsl-layerscape/spl.c:74:2: warning: implicit
declaration of function 'i2c_init_all'; did you mean 'misc_init_r'?
[-Wimplicit-function-declaration]`
Signed-off-by: Biwen Li <biwen.li@nxp.com> Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
Michael Walle [Tue, 17 Dec 2019 23:10:00 +0000 (00:10 +0100)]
arm: dts: ls1028a: fix interrupt properties
Sync the interrupt properties with the ones from Linux. Also use the
constants provided by the dt-bindings header. Please note, that there
are actual changes/fixes in the irq flags. U-Boot won't use the
interrupt properties anyway. It's just to be consistent with the Linux
device tree.
Signed-off-by: Michael Walle <michael@walle.cc> Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
Tom Rini [Mon, 27 Jan 2020 21:23:29 +0000 (16:23 -0500)]
azure: Move to vs2017-win2016 platform build host
Azure is moving to remove the vs2015-win2012r2 platform build host. The
two suggested new platforms to use are vs2017-win2016 and windows-2019.
For now, move up to vs2017-win2016.
Cc: Bin Meng <bmeng.cn@gmail.com> Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
* The value of the register is contained in the variable 'reg', not in
'mode'. The variable 'mode' contains only the configuration whether
the gpio is currently an input or an output.
* The correct bitmasks for the input and output value are
PAD_CFG0_RX_STATE and PAD_CFG0_TX_STATE.
Use them instead of the currently used PAD_CFG0_RX_STATE_BIT and
PAD_CFG0_TX_STATE_BIT.
Signed-off-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
gpio: intel_gpio: Clear tx state bit when setting output
Add missing 'PAD_CFG0_TX_STATE' to the clear mask for pcr_clrsetbits32().
Otherwise this bit cannot be cleared again after it has been set once.
Signed-off-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
gpio: intel_gpio: Pass pinctrl device to pcr_clrsetbits32()
The function pcr_clrsetbits32() expects a device with a P2SB parent
device. In intel_gpio_direction_output() and intel_gpio_set_value()
the device 'dev' is passed to pcr_clrsetbits32(), which is a
gpio-controller with a device 'pinctrl' as parent. This does not match
the expectations of pcr_clrsetbits32(). But the 'pinctrl' device has a
P2SB as parent.
Pass the 'pinctrl' device instead of the 'dev' device to
pcr_clrsetbits32().
Signed-off-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Wolfgang Wallner [Wed, 22 Jan 2020 15:01:47 +0000 (16:01 +0100)]
x86: itss: Remove apl-prefix
The Interrupt Timer Subsystem (ITSS) is not specific to Apollo Lake, so
remove the apl-prefix of the implemented functions/structures/...
Signed-off-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
x86: itss: Add a Kconfig option to enable/disable ITSS driver
Add a Kconfig option to support enabling/disabling the inclusion of
the ITSS driver depending on the platform.
Atuomatically select the ITSS driver when building for Apollo Lake.
Signed-off-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: squashed in http://patchwork.ozlabs.org/patch/1232761/] Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Wolfgang Wallner [Wed, 22 Jan 2020 15:01:46 +0000 (16:01 +0100)]
x86: Move itss.c from Apollo Lake to a more generic location
The Interrupt Timer Subsystem (ITSS) is not specific to Apollo Lake, so
move it to a common location within arch/x86.
Signed-off-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: conditionally build itss.c] Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Marek Vasut [Fri, 24 Jan 2020 04:44:24 +0000 (05:44 +0100)]
watchdog: omap_wdt: Fix WDT reloading
The watchdog timer value was never updated in the hardware by this
driver, so the watchdog triggered on some random stale value that
was left in the hardware. The TI SPRUH37C says, quote:
20.4.3.9 Modifying Timer Count/Load Values and Prescaler Setting
...
After a write access, the load register value and prescaler ratio
registers are updated immediately, but new values are considered
only after the next consecutive counter overflow or after a new
trigger command (the WDT_WTGR register).
This means at least one trigger must happen. The driver probably
depended on someone calling it's .reset() callback, however that
is not guaranteed e.g. if the WDT operates without servicing.
Marek Vasut [Fri, 24 Jan 2020 04:44:23 +0000 (05:44 +0100)]
watchdog: omap_wdt: Fix WDT timeout configuration
The timeout parameter of omap3_wdt_start() is in miliseconds, while
GET_WLDR_VAL() expects parameter in seconds. Fix this so the WDT
driver is actually usable.
drivers/gpio/da8xx_gpio.c: In function ‘davinci_get_gpio_bank’:
drivers/gpio/da8xx_gpio.c:446:9: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
return (struct davinci_gpio *)addr;
arm: mach-k3: sysfw-loader: Add support to download SYSFW via DFU
Add support to download SYSFW into internal RAM via DFU in DFU boot
mode. Prepare a DFU config entity entry dynamically using buffer address
allocated for SYSFW and start DFU gadget to get SYSFW.
arm: mach-k3: j721e: Rename BOOT_DEVICE_USB to BOOT_DEVICE_DFU
J721e does not support USB Host MSC boot, but only supports DFU boot.
Since BOOT_DEVICE_USB is often used for host boot mode and
BOOT_DEVICE_DFU is used for DFU boot, rename BOOT_DEVICE_USB macro to
BOOT_DEVICE_DFU
The current environment offset overlaps with the sysfw area and whenever
environment is saved in the redundant slot, it overwrites sysfw.itb. Fix
the offset to prevent this.
Signed-off-by: Faiz Abbas <faiz_abbas@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Sam Protsenko [Fri, 24 Jan 2020 15:53:48 +0000 (17:53 +0200)]
env: ti: boot: Boot Android with dynamic partitions
Changes:
- use boot.img instead of boot_fit.img
- use .dtb from boot.img v2
- implement recovery boot
- always boot ramdisk from boot.img, we can't mount system as root
now, as system is a logical partition inside of super partition
- don't add "skip_initramfs" to cmdline anymore
- to boot into recovery, use boot image from recovery partition
- prepare partition table:
- A/B scheme
- use 'super' partition instead of 'system' and 'vendor'
- add dtbo partitions
- introduce metadata partition
Not implemented: reading and applying dtbo blobs from dtbo partition.
Signed-off-by: Sam Protsenko <joe.skb7@gmail.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Sam Protsenko [Fri, 24 Jan 2020 15:53:44 +0000 (17:53 +0200)]
doc: android: Convert to Sphinx format
Convert Android documentation from regular txt format to Sphinx (RST).
Also add Android index.rst file and reference it in root index.rst, so
that Android documentation is visible.
Test:
$ make htmldocs
$ xdg-open doc/output/index.html
Signed-off-by: Sam Protsenko <joe.skb7@gmail.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Sam Protsenko [Fri, 24 Jan 2020 15:53:42 +0000 (17:53 +0200)]
cmd: abootimg: Add abootimg command
This command can be used to extract fields and image payloads from
Android Boot Image. It can be used for example to implement boot flow
where dtb is taken from boot.img (as v2 incorporated dtb inside of
boot.img). Using this command, one can obtain needed dtb blob from
boot.img in scripting manner, and then apply needed dtbo's (from "dtbo"
partition) on top of that, providing then the resulting image to bootm
command in order to boot the Android.
Also right now this command has the sub-command to get an address and
size of recovery dtbo from recovery image (for non-A/B devices only,
see [1,2] for details).
It can be tested like this:
=> mmc dev 1
=> part start mmc 1 boot_a boot_start
=> part size mmc 1 boot_a boot_size
=> mmc read $loadaddr $boot_start $boot_size
=> abootimg get ver
=> abootimg dump dtb
Sam Protsenko [Fri, 24 Jan 2020 15:53:41 +0000 (17:53 +0200)]
image: android: Add routine to get dtbo params
Android Boot Image v1 adds "Recovery DTB" field in image header and
associate payload in boot image itself [1]. Payload should be in
Android DTB/DTBO format [2]. That "Recovery DTB" area should be only
populated for non-A/B devices, and only in recovery image.
Add function to get an address and size of that payload. That function
can be further used e.g. in 'abootimg' command to provide the user a way
to get the address of recovery dtbo from U-Boot shell, which can be
further parsed using 'adtimg' command.
Sam Protsenko [Fri, 24 Jan 2020 15:53:40 +0000 (17:53 +0200)]
image: android: Add functions for handling dtb field
Android Boot Image v2 adds "DTB" payload (and corresponding field in the
image header). Provide functions for its handling:
- android_image_get_dtb_by_index(): Obtain DTB blob from "DTB" part of
boot image, by blob's index
- android_image_print_dtb_contents(): Iterate over all DTB blobs in
"DTB" part of boot image and print those blobs info
"DTB" payload might be in one of the following formats:
1. concatenated DTB blobs
2. Android DTBO format
The latter requires "android-image-dt.c" functionality, so this commit
selects that file for building for CONFIG_ANDROID_BOOT_IMAGE option.
Right now this new functionality isn't used, but it can be used further.
As it's required to apply some specific dtbo blob(s) from "dtbo"
partition, we can't automate this process inside of "bootm" command. But
we can do next:
- come up with some new command like "abootimg" to extract dtb blob
from boot image (using functions from this patch)
- extract desired dtbo blobs from "dtbo" partition using "adtimg"
command
- merge dtbo blobs into dtb blob using "fdt apply" command
- pass resulting dtb blob into bootm command in order to boot the
Android kernel with Android ramdisk from boot image
Signed-off-by: Sam Protsenko <joe.skb7@gmail.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Wolfgang Wallner [Wed, 22 Jan 2020 15:01:45 +0000 (16:01 +0100)]
x86: Move itss.h from Apollo Lake to the generic x86 include directory
The code in this file is not specific to Apollo Lake. According to
coreboot sources (where this code comes from), it is common to at least:
* Apollo Lake
* Cannon Lake
* Ice Lake
* Skylake
Signed-off-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Wolfgang Wallner [Wed, 22 Jan 2020 15:01:44 +0000 (16:01 +0100)]
x86: apl: Add the term "Interrupt Timer Subsystem" to ITSS files
ITSS stands for "Interrupt Timer Subsystem", so add that term to the
description of the relevant files.
Signed-off-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Wolfgang Wallner [Tue, 14 Jan 2020 13:05:48 +0000 (14:05 +0100)]
spi: ich: Drop while loop in hardware sequencing erase case
When ich_spi_exec_op_hwseq() is called to erase a 4k block
(opcode = SPINOR_OP_BE_4K), it expects to find a length value in
op->data.nbytes, but that value is always 0. As a result, the while loop
is never executed and no erase is carried out.
Fix this by dropping the loop code entirely, only keeping the relevant
parts of the loop body.
See http://patchwork.ozlabs.org/patch/1222779/ for more detailed
background information and discussion.
Signed-off-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Andy Shevchenko [Thu, 9 Jan 2020 21:12:35 +0000 (23:12 +0200)]
x86: edison: Switch to ACPI mode
SFI is quite poor and useless resource provider. Moreover it makes hard
to develop and extend functionality in the Linux kernel.
Enable a necessary minimum to use ACPI on Intel Edison.
Linux kernel have been prepared for this change since v5.4, where the last
crucial driver, i.e. for Basin Cove PMIC, has been submitted.
Note, that stock image won't suffer by this change since it doesn't have
ACPI enabled on the kernel level.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Marek Vasut [Thu, 9 Jan 2020 21:12:34 +0000 (23:12 +0200)]
x86: edison: Enable command line editing
Enable command line editing, because it is extremely convenient.
Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Use valid restructured text to avoid warnings like
WARNING: Title underline too short.
WARNING: Block quote ends without a blank line; unexpected unindent.
when building with `make htmldocs`.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
Masahiro Yamada [Wed, 8 Jan 2020 11:13:42 +0000 (20:13 +0900)]
x86: limit the fs segment to the pointer size
The fs segment is only used to get the global data pointer.
If it is accessed beyond sizeof(new_gd->arch.gd_addr), it is a bug.
To specify the byte-granule limit size, drop the G bit, so the
flag field is 0x8093 instead of 0xc093, and set the limit field
to sizeof(new_gd->arch.gd_addr) - 1.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: fixed the comments about FS segement] Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Masahiro Yamada [Wed, 8 Jan 2020 11:08:44 +0000 (20:08 +0900)]
x86: use invd instead of wbinvd in real mode start code
I do not know why the boot code immediately after the system reset
should write-back the cache content. I think the cache invalidation
should be enough.
I tested this commit with qemu-x86_defconfig, and it worked for me.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Tested-by: Bin Meng <bmeng.cn@gmail.com>
Park, Aiden [Wed, 18 Dec 2019 05:56:29 +0000 (05:56 +0000)]
doc: intel: Update serial driver changes in slimbootloader.rst
Now, Slim Bootloader uses NS16550_DYNAMIC to support serial port
configuration at runtime, so no more code change is required.
Therefore, remove unnecessary steps and fix minor typo.
Signed-off-by: Aiden Park <aiden.park@intel.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Park, Aiden [Wed, 18 Dec 2019 05:56:23 +0000 (05:56 +0000)]
x86: serial: Use NS16550_DYNAMIC in Slim Bootloader
Slim Bootloader provides serial port info in its HOB to support
both IO or MMIO serial ports, but it's controlled by SYS_NS16550_MEM32
or SYS_NS16550_PORT_MAPPED in U-Boot.
To support both serial port configurations dynamically at runtime,
Slim Bootloader serial driver leverages NS16550_DYNAMIC.
Signed-off-by: Aiden Park <aiden.park@intel.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: remove the obsolete comments for data->type] Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Simon Glass [Fri, 20 Dec 2019 00:58:18 +0000 (17:58 -0700)]
serial: ns16550: Support run-time configuration
At present this driver uses an assortment of CONFIG options to control
how it accesses the hardware. This is painful for platforms that are
supposed to be controlled by a device tree or a previous-stage bootloader.
Add a new CONFIG option to enable fully dynamic configuration. This
controls register spacing, size, offset and endianness.
Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Aiden Park <aiden.park@intel.com> Tested-by: Aiden Park <aiden.park@intel.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: squashed in http://patchwork.ozlabs.org/patch/1232929/] Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Tom Rini [Fri, 31 Jan 2020 18:26:28 +0000 (13:26 -0500)]
Merge tag 'uniphier-v2020.04-2' of https://gitlab.denx.de/u-boot/custodians/u-boot-uniphier
UniPhier SoC updates for v2020.04 (2nd)
Denali NAND driver changes:
- Set up more registers in denali-spl for SOCFPGA
- Make clocks optional
- Do not assert reset signals in the remove hook
- associate SPARE_AREA_SKIP_BYTES with DT compatible
- switch to UCLASS_MTD
UniPhier platform changes:
- fix a bug in dram_init()
- specify loadaddr for "source" command
Masahiro Yamada [Wed, 29 Jan 2020 15:55:54 +0000 (00:55 +0900)]
mtd: rawnand: denali_dt: insert udelay() after reset deassert
When the reset signal is de-asserted, the HW-controlled bootstrap
starts running unless it is disabled in the SoC integration.
It issues some commands to detect a NAND chip, and sets up registers
automatically. Until this process finishes, software should avoid
any register access.
Without this delay function, some of UniPhier boards hangs up while
executing nand_scan_ident(). (denali_read_byte() is blocked)
projects / u-boot.git / log
