Hello,
I am using a Linux evaluation board MBa6x with the TQMa6x module. The system is configured in order to boot from eMMC. I would like to use the tool fw_printenv and get following result:
fw_printenv Warning: Bad CRC, using default environment bootargs= bootcmd= bootdelay=2 baudrate=115200 ...
The content of /etc/fw_env.config is as follows: cat /etc/fw_env.config # Configuration file for fw_(printenv/setenv) utility. # Up to two entries are valid, in this case the redundant # environment sector is assumed present. # Notice, that the "Number of sectors" is ignored on NOR and SPI-dataflash. # Futhermore, if the Flash sector size is ommitted, this value is assumed to # be the same as the Environment size, which is valid for NOR and SPI-dataflash
# THIS IS VALID FOR TQMa6x eMMC-card only! # eMMC Block device access /dev/mmcblk00x1000000x2000 # if using with redundant env /dev/mmcblk00x1020000x2000 ...
As a first action, I interrupted the boot process to enter the u-boot shell. Within the u-boot shall I forced to re-write the environment variables by using the command saveenv. This seems to work without any issues. => saveenv Saving Environment to MMC... Writing to MMC(0)... done
But next time, when the system reboots, the fw_printenv command issues the same result as described above (Bad CRC...). Next action I have done is to dump the content of the memory at address 0x100000, which seems to be ok.
hexdump -C -s 0x100000 -n 8192 /dev/mmcblk0 00100000 95 fc 63 38 61 64 64 63 6d 61 3d 73 65 74 65 6e |..c8addcma=seten| 00100010 76 20 62 6f 6f 74 61 72 67 73 20 24 7b 62 6f 6f |v bootargs ${boo| ...
A hexdump at address 0x102000 seems to be incorrect. Maybe this is the root cause of the bad CRC issue? hexdump -C -s 0x102000 -n 8192 /dev/mmcblk0 00102000 18 00 9f e5 95 24 01 eb 3c 30 94 e5 04 00 a0 e1 |.....$..<0......| 00102010 08 30 43 e2 3c 30 84 e5 80 ff ff eb 7b ff ff eb |.0C.<0......{...| ...
Here is also the output of /dev
ls /dev ... cuse memory_bandwidth stdout disk mmcblk0 tty dri mmcblk0boot0 ttymxc1 fd mmcblk0boot1 ttymxc2 full mmcblk0p1 ttymxc3 fuse mmcblk0p2 ttymxc4 gpiochip0 mmcblk0p3 ubi_ctrl gpiochip1 mmcblk0rpmb uhid gpiochip2 mmcblk1 uinput gpiochip3 mmcblk1p1 urandom gpiochip4 mmcblk1p2 v4l gpiochip5 mmcblk1p3 vga_arbiter gpiochip6 mqueue video0 ...
Thank you for any hints you could provide in order to solve this issue.
Regards, Robert Varga
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