PROCESSOR-SDK-AM62X: SDCard(mmc1) Boot and u-boot saveenv command

Hi,

1. You could erase that parititon in eMMC using fdisk command:

fdisk /dev/mmcblk0

Then select 'd' to delete the partition.

The following doc seems to explain this well enough: https://docs.oracle.com/cd/E88353_01/html/E72487/fdisk-8.html

2. For AM62x on 08.06 SDK, we need save U-boot environment by default to eMMC, if you wish to save to SD card try the following patch, but for AM62x:

diff --git a/configs/j721e_evm_a72_defconfig b/configs/j721e_evm_a72_defconfig
index a6d3cb6866..2ea212fa17 100644
--- a/configs/j721e_evm_a72_defconfig
+++ b/configs/j721e_evm_a72_defconfig
@@ -80,10 +80,11 @@ CONFIG_OF_LIST="k3-j721e-common-proc-board k3-j721e-tps65917-proc-board k3-j721e
 CONFIG_SPL_MULTI_DTB_FIT=y
 CONFIG_SPL_MULTI_DTB_FIT_NO_COMPRESSION=y
 CONFIG_ENV_OVERWRITE=y
-CONFIG_ENV_IS_IN_MMC=y
 CONFIG_SYS_REDUNDAND_ENVIRONMENT=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
-CONFIG_SYS_MMC_ENV_PART=1
+CONFIG_ENV_IS_NOWHERE=y
+CONFIG_ENV_IS_IN_FAT=y
+CONFIG_ENV_FAT_DEVICE_AND_PART="1:1"
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_DM=y
 CONFIG_SPL_DM=y
diff --git a/configs/j721e_evm_r5_defconfig b/configs/j721e_evm_r5_defconfig
index 01dadb98bf..f6620698dd 100644
--- a/configs/j721e_evm_r5_defconfig
+++ b/configs/j721e_evm_r5_defconfig
@@ -68,6 +68,7 @@ CONFIG_SPL_MULTI_DTB_FIT=y
 CONFIG_SPL_OF_LIST="k3-j721e-r5-common-proc-board k3-j721e-r5-eaik"
 CONFIG_SPL_MULTI_DTB_FIT_NO_COMPRESSION=y
 CONFIG_ENV_OVERWRITE=y
+CONFIG_ENV_IS_NOWHERE=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_DM=y
 CONFIG_SPL_DM=y

Hi TI_Expert,

Thank you the reply, with above mentioned patch changes, u-boot environment saved into FAT partition and also uboot.env file created into mmc 1:1(SDCard).

But Problem is :
In the uEnv.txt file, I added one command, which will set three variables once uEnv.txt is loaded, but here those variables are set and stored in uboot.env file which is at FAT partition of SDCard(MMC1), not saved in default u-boot environment variables.

I wish to save my uEnv.txt commands output into default u-boot environment and FAT partition(i.e. uboot.env file), because of my target will boot based on variables which are set by command in uEnv.txt file. Currently, that command output is not saved into default u-boot environment.

Can i know reason my uEnv.txt command output not saved into default uboot environment when target is booting with SDCard ?? what changes/modifications needs to do for that ?

For your reference :-

1) Please find below attached image, the output of fw_printenv command which is use uboot.env file and printenv command output at u-boot prompt.

2) Please find Attached link for uEnv.txt and am62xx_boot_logs file, in which both fw_printenv and printenv command output at u-boot prompt logs there.

file:///C:/Users/Ambatima/Desktop/uboot_env_issue/

Best regards,

Mallikarjuna

Hi Mallikarjuna,

Can you try adding:

=> run envboot

to the arge_mmc environment variable?

Run envboot should load 'uEnv.txt' as shown:

=> run envboot
switch to partitions #0, OK
mmc1 is current device
SD/MMC found on device 1
Failed to load 'boot.scr'
Failed to load 'uEnv.txt'
=> 

Hi Judith,

envboot command already there in enviroment and it's loading uEnv.txt file.

In u-boot, 1st bootcmd_linux command is running, it will run following commands in sequence order

   findfdt, envboot, init_mmc(args_all, args_mmc), get_kern_mmc, get_fdt_mmc, get_overlay_mmc, run_kern(it will boot kernel).

Problem is :- 

Here, I am able to load uEnv.txt file but when saveenv command is executed, it's not saving into default environment at u-boot level but it's creating uboot.env file where uEnv.txt related changes are updated.

I want to save my uEnv.txt file related changes into both default u-boot environment and into uboot.env file. For that, any specific changes are required ?

Attaching links to download uEnv.txt file and boot_logs(In which, you can see printenv and fw_printenv output)

/cfs-file/__key/communityserver-discussions-components-files/791/6102.uEnv.txt

/cfs-file/__key/communityserver-discussions-components-files/791/am62xx_5F00_boot_5F00_logs.txt

Hi,

I am OOO and will respond as soon as I get back.

~ Judith

Hi,

What processor SDK are you using?
 08.06?

Also, are you trying to load u-boot environment from uEnv.txt and also to save u-boot environment to uEnv.txt?

Is so, you could use the following commands:

=> printenv bootenvfile
bootenvfile=uEnv.txt
=> printenv mmcdev
mmcdev=1

Writing environment to SD card
   => env export -t $loadaddr
   => fatwrite mmc ${mmcdev} ${loadaddr} ${bootenvfile} ${filesize}


Loading environment from SD card
   => run envboot

or

~Judith

Hi Judith,

Yes, we are using 08.06.00.003 SDK.

we already using commands that you suggested above,

for loading environment, we are using run envboot command. 

Here, I am sharing u-boot logs of am62xx SK and am335x-evm boards where both boards are booting from SDcard.

AM335x u-boot logs

U-Boot SPL 2020.01-g2781231a33 (Mar 26 2021 - 17:56:23 +0000)
Trying to boot from MMC1
U-Boot 2020.01-g2781231a33 (Mar 26 2021 - 17:56:23 +0000)
CPU : AM335X-GP rev 2.1
Model: TI AM335x EVM
DRAM: 1 GiB
WDT: Started with servicing (60s timeout)
NAND: 0 MiB
MMC: OMAP SD/MMC: 0
Loading Environment from FAT... OK
Net: eth0: ethernet@4a100000
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is 0c:1c:57:08:28:fb, eth1: usb_ether
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
1396 bytes read in 4 ms (340.8 KiB/s)
Loaded env from uEnv.txt
Importing environment from mmc0 ...
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
ROOTFS_B exist
Saving Environment to FAT... OK
5427712 bytes read in 353 ms (14.7 MiB/s)
95597 bytes read in 13 ms (7 MiB/s)
## Flattened Device Tree blob at 88000000
Booting using the fdt blob at 0x88000000
Loading Device Tree to 8ffe5000, end 8ffff56c ... OK

AM62xx u-boot logs

U-Boot 2021.01-g999 (Aug 25 2023 - 13:35:48 +0000)

SoC: AM62X SR1.0 GP
Model: Texas Instruments AM625 SK
EEPROM not available at 0x50, trying to read at 0x51
Board: AM62-SKEVM rev E3
DRAM: 2 GiB
MMC: mmc@fa10000: 0, mmc@fa00000: 1, mmc@fa20000: 2
In: serial@2800000
Out: serial@2800000
Err: serial@2800000
Net: eth0: ethernet@8000000port@1
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc1 is current device
SD/MMC found on device 1
Failed to load 'boot.scr'
1671 bytes read in 3 ms (543.9 KiB/s)
Loaded env from uEnv.txt
Importing environment from mmc1 ...
Saving Environment to FAT... OK
19567104 bytes read in 410 ms (45.5 MiB/s)
59144 bytes read in 5 ms (11.3 MiB/s)
## Flattened Device Tree blob at 88000000
Booting using the fdt blob at 0x88000000
Loading Device Tree to 000000008feee000, end 000000008fffffff ... OK

Observations from above u-boot logs :-

In am335x, Environment is saved to FAT partition and while booting, environment is loading from FAT partition whatever we saved using uEnv.txt.

where as, In am62xx, Environment is saved to FAT partition but while booting, environment is not loading from FAT partition.

Question:

So, In am62xx, to load from environment from FAT partition while booting like am335x, What changes or any u-boot configuration changes are required ?

For reference, please go through above shared  u-boot logs of both am335x and am62xx sk board.

Thanks and Regards,

Mallikarjuna Reddy Ambati.