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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