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u-boot: reading environment from SD card SOMETIMES does not work #5

Closed nazgee closed 6 years ago

nazgee commented 6 years ago

Not sure what is wrong. I modified the u-boot source code to display the offset of the environment, and saveenv seem to be OK

=> setenv ethaddr 00:19:b8:00:00:02
=> saveenv
Saving Environment to MMC...
Writing to MMC(0) @ 1048576... done

1048576 matches this:

/* 1MB after beginning of disk (uboot ends around 0.5MB right now) */
#define CONFIG_ENV_OFFSET       (1 * 1024 * 1024)

But on 50% (?) of boots, I get this: 

U-Boot 2017.07-28702-g93ad9ec-dirty (Feb 24 2018 - 13:02:05 +0100)

CPU:   Freescale i.MX6QP rev1.0 at 792 MHz
Reset cause: WDOG
Board: nexo
I2C:   ready
DRAM:  2 GiB
MMC:   FSL_SDHC: 0, FSL_SDHC: 1
*** Warning - read failed, using default environment

No idea if there is something wrong with board layout, or we've miss-configured it somehow....

note: there is no point in trying to read the environment if you have not saved it using saveenv

nazgee commented 6 years ago

switched card from a 1GB 'no category' to 4GB CAT-4 and it works... shit.