[BUG] mx6cuboxi : broken MMC support

[Baruch Siach]

Hi François

On Sat, Oct 10 2020, François Perrad wrote:
> With 2020.07 (or 2020.04 or 2020.10), something goes wrong on this board.
> I think it is related to
> https://gitlab.denx.de/u-boot/u-boot/-/commit/6c3fbf3e456c49c2f43c0c286106a0d4b099b67b
>
> 2020.01 works fine with mmc0 (mmc0 is current device)
> 2020.07 fails with mmc1
> both versions are built in the Builroot environment,
> and I use a Micro SD with the Cubox.
>
> Here, the working version 2020.01
>
> U-Boot SPL 2020.01 (Oct 09 2020 - 22:28:05 +0200)
> Trying to boot from MMC1
>
>
> U-Boot 2020.01 (Oct 09 2020 - 22:28:05 +0200)
>
> CPU:   Freescale i.MX6SOLO rev1.3 996 MHz (running at 792 MHz)
> CPU:   Commercial temperature grade (0C to 95C) at 30C
> Reset cause: POR
> Board: MX6 Cubox-i
> DRAM:  512 MiB
> MMC:   FSL_SDHC: 0, FSL_SDHC: 1
> Loading Environment from MMC... *** Warning - bad CRC, using default
> environment
>
> No panel detected: default to HDMI
> Display: HDMI (1024x768)
> In:    serial
> Out:   serial
> Err:   serial
> Net:   FEC
> Hit any key to stop autoboot:  0
> switch to partitions #0, OK
> mmc0 is current device
> Scanning mmc 0:1...
> Found U-Boot script /boot/boot.scr
> 336 bytes read in 106 ms (2.9 KiB/s)
> ## Executing script at 12000000
> 36612 bytes read in 121 ms (294.9 KiB/s)
> 8552176 bytes read in 652 ms (12.5 MiB/s)
> ## Flattened Device Tree blob at 18000000
>    Booting using the fdt blob at 0x18000000
>    Using Device Tree in place at 18000000, end 1800bf03
>
> Starting kernel ...

The 'boot.scr' script here is board/solidrun/mx6cubox/boot.scr.txt from
the Buildroot repo:

setenv finduuid "part uuid mmc 0:1 uuid"
run finduuid
run findfdt
setenv bootargs "console=ttymxc0,115200 root=PARTUUID=${uuid} rootwait rootfstype=ext4"
load mmc 0:1 ${fdt_addr} boot/${fdtfile}
load mmc 0:1 ${loadaddr} boot/zImage
bootz ${loadaddr} - ${fdt_addr}

Is that correct?

> Now, with the version 2020.07
>
> U-Boot SPL 2020.07 (Oct 06 2020 - 13:33:44 +0200)
> WDT:   Not found!
> Trying to boot from MMC1
>
>
> U-Boot 2020.07 (Oct 06 2020 - 13:33:44 +0200)
>
> CPU:   Freescale i.MX6SOLO rev1.3 996 MHz (running at 792 MHz)
> CPU:   Commercial temperature grade (0C to 95C) at 36C
> Reset cause: POR
> Board: MX6 Cubox-i
> DRAM:  512 MiB
> MMC:   FSL_SDHC: 1, FSL_SDHC: 2
> Loading Environment from MMC... *** Warning - bad CRC, using default
> environment
>
> No panel detected: default to HDMI
> Display: HDMI (1024x768)
> In:    serial
> Out:   serial
> Err:   serial
> Net:
> Warning: ethernet at 2188000 using MAC address from ROM
> eth0: ethernet at 2188000
> Hit any key to stop autoboot:  0
> switch to partitions #0, OK
> mmc1 is current device
> Scanning mmc 1:1...

This might be the cause of the problem. The script listed above
hardcodes "mmc 0:1". Changing that to "mmc 1:1" might fix this issue.

baruch

> Found U-Boot script /boot/boot.scr
> 336 bytes read in 12 ms (27.3 KiB/s)
> ## Executing script at 12000000
> SCRIPT FAILED: continuing...
> switch to partitions #0, OK
> mmc2(part 0) is current device
> ** No partition table - mmc 2 **
> No SATA device found!
> starting USB...

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