From: Eduard Strehlau <eduard@lionizers.com>
Date: Wed, 26 Apr 2023 16:04:54 +0000 (-0300)
Subject: smegw01: Enable EMMC boot from multiple partitions
X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=31c6c79a01c05dca9ab93b42f0f97d973a4db61f;p=u-boot.git

smegw01: Enable EMMC boot from multiple partitions

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>
---

diff --git a/board/storopack/smegw01/smegw01.c b/board/storopack/smegw01/smegw01.c
index e6bff80e55..7d4de9326d 100644
--- a/board/storopack/smegw01/smegw01.c
+++ b/board/storopack/smegw01/smegw01.c
@@ -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;
+}
diff --git a/configs/smegw01_defconfig b/configs/smegw01_defconfig
index b3580d5d6e..54cf1cfc1f 100644
--- a/configs/smegw01_defconfig
+++ b/configs/smegw01_defconfig
@@ -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
diff --git a/include/configs/smegw01.h b/include/configs/smegw01.h
index 277c828d0e..71f2d9c8e8 100644
--- a/include/configs/smegw01.h
+++ b/include/configs/smegw01.h
@@ -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 " \