From: Sam Protsenko <semen.protsenko@linaro.org>
Date: Thu, 21 Sep 2017 19:37:57 +0000 (+0300)
Subject: arm: dra7xx: Fix Linux boot from eMMC
X-Git-Tag: v2025.01-rc5-pxa1908~5675
X-Git-Url: http://git.dujemihanovic.xyz/%22http:/www.sics.se/static/login.html?a=commitdiff_plain;h=a0b0ff0ae643b77a3c40bfa87dc2ffa964b4371a;p=u-boot.git

arm: dra7xx: Fix Linux boot from eMMC

Right now on OMAP5-based boards we have only one partition defined for
Linux boot, which is rootfs. That doesn't work with bootpart=1:2 (that
is defined in include/environment/ti/boot.h). To fix Linux boot we may
either:

 1. Change bootpart to be 1:1
 2. Or add preceding partition, so that rootfs is actually 1:2

Second choice seems more reasonable, as DFU is already using similar
partition table and can rely on bootpart to be 1:2.

This patch adds "bootloader" partition. So now eMMC layout for Linux
boot looks like this:

offset               content                 size          partition
(KiB)                                        (KiB)
Reviewed-by: Tom Rini <trini@konsulko.com>

=======================================================================

0       +--------------------------------+
        | MBR/GPT header                 |   128           -
128     +--------------------------------+
        | MLO                            |   256           -
384     +--------------------------------+
        | u-boot.img                     |   1792          bootloader
2176    +--------------------------------+
        | //////////// hole //////////// |   256           -
2432    +--------------------------------+
        | U-Boot environment             |   128           -
2560    +--------------------------------+
        | U-Boot environment (redundant) |   128           -
2688    +--------------------------------+
        | rootfs                         |   remaining     rootfs
end     +--------------------------------+

=======================================================================

Guard hole appears because U-Boot environment offset was calculated for
Android partition table, which has two additional partitions in place of
that hole ("environment" and "misc" partitions).

This patch also changes rootfs offset from 2 MiB further to 2688 KiB,
so that there won't be any collisions with U-Boot environment when we
flash rootfs.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
---

diff --git a/include/configs/dra7xx_evm.h b/include/configs/dra7xx_evm.h
index 6c0fc35d3a..1555fc1b50 100644
--- a/include/configs/dra7xx_evm.h
+++ b/include/configs/dra7xx_evm.h
@@ -51,7 +51,8 @@
 #define PARTS_DEFAULT \
 	/* Linux partitions */ \
 	"uuid_disk=${uuid_gpt_disk};" \
-	"name=rootfs,start=2MiB,size=-,uuid=${uuid_gpt_rootfs}\0" \
+	"name=bootloader,start=384K,size=1792K,uuid=${uuid_gpt_bootloader};" \
+	"name=rootfs,start=2688K,size=-,uuid=${uuid_gpt_rootfs}\0" \
 	/* Android partitions */ \
 	"partitions_android=" \
 	"uuid_disk=${uuid_gpt_disk};" \