AM625: saveenv throws error exceeds max(0x2000)

siva nallamalli

Part Number: AM625

we are working on custom board based on am625 sk.

Modified include/environment/ti/k3_dfu.h file to support write images to emmc partition schema to support USB firmware upgrade.

#define DFU_ALT_INFO_EMMC \
        "dfu_alt_info_emmc=" \
        "rawemmc raw 0 0x800000 mmcpart 1;" \
        "rootfs_A part 0 2 mmcpart 0;" \
        "rootfs_B part 0 3 mmcpart 0;" \
        "Upgrade part 0 4 mmcpart 0;" \
        "tiboot3.bin.raw raw 0x0 0x400 mmcpart 1;" \
        "tispl.bin.raw raw 0x400 0x1000 mmcpart 1;" \
        "u-boot.img.raw raw 0x1400 0x2000 mmcpart 1;" \
        "u-env.raw raw 0x3400 0x200 mmcpart 1;" \
        "uEnv.txt raw raw 0x3700 0x100 mmcpart 1\0"

i am able to do dfu of rootfs_A,rootfs_B,tiboot3.bin,tispl.bin,u-boot.img,uEnv.txt from host machine. Able to boot linux from both partiutions.

I need to save the env variables to a blob file & update the blob from linux using fw_setenv commands.

saveenv gives error.

=>saveenv

Saving Environment to MMC... Writing to MMC(0)... MMC: block number 0x3500 exceeds max(0x2000)
failed
Failed (1)

Any help on where to look into this.

over 2 years ago

0 Hong Guan64 over 2 years ago

TI__Guru* 76390 points

Hello Siva,
As noted in another e2e,
e2e.ti.com/.../4944609
"u-boot cmd "saveenv" is disabled by default in the newer SDK as it sometimes causes inconsistencies in the boot flow."

siva nallamalli said:
Saving Environment to MMC... Writing to MMC(0)... MMC: block number 0x3500 exceeds max(0x2000)

Do we know the size of eMMC boot partition on your board? It looks like 4MB?
Best,
-Hong

0 siva nallamalli over 2 years ago in reply to Hong Guan64

Intellectual 860 points

I am using the existing partition already available in u-boot.

https://software-dl.ti.com/jacinto7/esd/processor-sdk-linux-jacinto7/08_06_01_02/exports/docs/linux/Foundational_Components/U-Boot/UG-Memory.html#partitioning-emmc-from-u-boot

size of emmc boot partition is 8MB.

0 Shashank Kulkarni over 2 years ago in reply to siva nallamalli

TI__Expert 3960 points

Hi Siva - the eMMC you are using has 4 MB boot partitions - 2 in number. In all probability, you need to increase the size of your boot partition beyond 4 MB.

Can you try to do this in u-boot by using the mmc bootpart-resize command?

Regards,

Shashank

0 Hong Guan64 over 2 years ago in reply to Shashank Kulkarni

TI__Guru* 76390 points

Hello Siva,
I'd recommend to customemize binary layout within eMMC.
This is one reference on how to customize binary offset within eMMC boot partition.
e2e.ti.com/.../faq-am62x-how-to-customize-emmc-and-ospi-flash-layout-for-spl-u-boot-booting-with-ti-am62x-linux-sdk
Best,
-Hong

0 siva nallamalli over 2 years ago in reply to Hong Guan64

Intellectual 860 points

Hi Huang,

with below u-boot command

=>ums 0 mmc 0

I am able to mount the board EMMC on my linux machine. Now i am having custom script which we used for flashing & partitioning images to SDCard.

With same script i am able to create Filesystem partitioning able to boot the board.

Now still saveenv command is still saving environment variables in MMC but not FAT and getting same error.

=>saveenv

Saving Environment to MMC... Writing to MMC(0)... MMC: block number 0x3500 exceeds max(0x2000)
failed
Failed (1)

I modified my am62xx_evm_a53_defconfig similar to the patch suggested in e2e.ti.com/.../4814838. But still i am getting same error.

-CONFIG_ENV_IS_IN_MMC=y
-CONFIG_SYS_MMC_ENV_PART=1
CONFIG_NET_RANDOM_ETHADDR=y
CONFIG_DM=y
CONFIG_SPL_DM=y
@@ -190,3 +188,13 @@ CONFIG_CMD_GPIO=y
CONFIG_OMAP3_SPI=y
CONFIG_CMD_DHCP=y
CONFIG_CMD_CUSTOM_DATETIME=y
+CONFIG_ENV_IS_NOWHERE=y
+CONFIG_ENV_IS_IN_FAT=y
+CONFIG_ENV_FAT_DEVICE_AND_PART="0:1

Regards,

Siva.

0 Hong Guan64 over 2 years ago in reply to siva nallamalli

TI__Guru* 76390 points

Hong Guan64 said:
As noted in another e2e,
e2e.ti.com/.../4944609
"u-boot cmd "saveenv" is disabled by default in the newer SDK as it sometimes causes inconsistencies in the boot flow."

Best,
-Hong

0 siva nallamalli over 2 years ago in reply to Hong Guan64

Intellectual 860 points

Hong,

My problem was saveenv command is available, It is not saving the variables in Fat partition. It is still pointing to raw EMMC.

This should be expected output.

=> saveenv
Saving Environment to FAT...
writing uboot.env
done

Regards,

Siva.

0 Hong Guan64 over 2 years ago in reply to siva nallamalli

TI__Guru* 76390 points

Hello Siva,
As noted
e2e.ti.com/.../4944609
"u-boot cmd "saveenv" is disabled by default in the newer SDK as it sometimes causes inconsistencies in the boot flow."
Some alternatives:
- build boot arguments to u-boot
- use "env export..." and "env import..."

Best,
-Hong

+1 siva nallamalli over 2 years ago in reply to Hong Guan64

Intellectual 860 points

Hi Huang,

After setting the boot mode pins [B3:B6]to 1 0 0 0 & with below a53 defconfig changes saveenv works fine. u-boot.env file genarated in FAT partition.

-CONFIG_ENV_IS_IN_MMC=y
-CONFIG_SYS_MMC_ENV_PART=1

-CONFIG_ENV_IS_NOWHERE=y
+CONFIG_ENV_IS_IN_FAT=y
+CONFIG_ENV_FAT_DEVICE_AND_PART="0:1"

since the boot mode pins [B3:B6] to 1 0 0 1, so the u-boot in the raw emmc is not having def config changes. Always saveenv commands tries to writes to raw EMMC partition which is not sufficient.

Regards,

Siva.

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AM625: saveenv throws error exceeds max(0x2000)