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smegw01: Enable EMMC boot from multiple partitions

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GPT Partition labels are used for determining the right
root filesystem to boot from.

The U-Boot environment is configured to reside in the eMMC hardware
boot partition we are currently booted from.

This should enable a dual copy approach for upgrading the bootloader.
One can overwrite the inactive hardware partition with new bootloader
and environment and afterwards switch the eMMC boot partition for an
atomic bootloader switch.

Signed-off-by: Eduard Strehlau <eduard@lionizers.com>
Signed-off-by: Fabio Estevam <festevam@denx.de>
This commit is contained in:
Eduard Strehlau 2023-04-26 13:04:54 -03:00 committed by Stefano Babic
parent 52726d24d6
commit 31c6c79a01
3 changed files with 20 additions and 4 deletions
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10
board/storopack/smegw01/smegw01.c
View file

@ -17,6 +17,7 @@
#include <asm/arch/crm_regs.h>
#include <asm/setup.h>
#include <asm/bootm.h>
#include <mmc.h>
DECLARE_GLOBAL_DATA_PTR;
@ -93,3 +94,12 @@ int board_late_init(void)
return 0;
}
uint board_mmc_get_env_part(struct mmc *mmc)
{
uint part = EXT_CSD_EXTRACT_BOOT_PART(mmc->part_config);
if (part == 7)
part = 0;
return part;
}

2
configs/smegw01_defconfig
View file

@ -30,6 +30,7 @@ CONFIG_CMD_MEMTEST=y
CONFIG_CMD_UNZIP=y
CONFIG_CMD_DFU=y
CONFIG_CMD_GPIO=y
CONFIG_CMD_GPT=y
CONFIG_CMD_MMC=y
CONFIG_CMD_PART=y
CONFIG_CMD_DHCP=y
@ -44,6 +45,7 @@ CONFIG_OF_CONTROL=y
CONFIG_ENV_OVERWRITE=y
CONFIG_SYS_REDUNDAND_ENVIRONMENT=y
CONFIG_SYS_RELOC_GD_ENV_ADDR=y
CONFIG_SYS_MMC_ENV_DEV=1
CONFIG_NET_RANDOM_ETHADDR=y
CONFIG_BOUNCE_BUFFER=y
CONFIG_BOOTCOUNT_LIMIT=y

12
include/configs/smegw01.h
View file

@ -32,17 +32,21 @@
"mmcpart=1\0" \
"mmcpart_committed=1\0" \
"mmcargs=setenv bootargs console=${console},${baudrate} " \
"root=/dev/mmcblk0p${mmcpart_committed} rootwait rw " \
__stringify(EXTRA_BOOTPARAMS) "\0" \
"root=/dev/mmcblk${mmcdev}p${gpt_partition_entry} rootwait rw " \
__stringify(EXTRA_BOOTPARAMS) " SM_ROOT_DEV=${mmcdev} SM_ROOT_PART=${gpt_partition_entry} SM_BOOT_PART=${boot_part}\0" \
"commit_mmc=if test \"${ustate}\" = 1 -a \"${mmcpart}\" != \"${mmcpart_committed}\"; then " \
"setenv mmcpart_committed ${mmcpart};" \
"saveenv;" \
"fi;\0" \
"bootlimit=3\0" \
"loadimage=load mmc ${mmcdev}:${mmcpart_committed} ${loadaddr} boot/${image}\0" \
"loadfdt=load mmc ${mmcdev}:${mmcpart_committed} ${fdt_addr} boot/${fdtfile}\0" \
"loadimage=load mmc ${mmcdev}#rootfs-${mmcpart_committed} ${loadaddr} boot/${image}\0" \
"loadfdt=load mmc ${mmcdev}#rootfs-${mmcpart_committed} ${fdt_addr} boot/${fdtfile}\0" \
"loadpart=gpt setenv mmc ${mmcdev} rootfs-${mmcpart_committed}\0" \
"loadbootpart=mmc partconf 1 boot_part\0" \
"mmcboot=echo Booting from mmc ...; " \
"run commit_mmc; " \
"run loadpart; " \
"run loadbootpart; " \
"run mmcargs; " \
"if run loadfdt; then " \
"if bootz ${loadaddr} - ${fdt_addr}; then " \