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The factory default uboot installed on the nand cannot do ext4load or ext4ls.

To recreate

Plug in sd card with ext4 partition.
Toggle boot_sel switch to boot from nand.
When uboot gives a prompt to press any key. press one.

Then run

ext4ls mmc 0:1

Hangs.

Andy reported it. Zubair and James Cowgill have tested their boards. Same issue. With ext4load too.

ext4load/ext4ls works when uboot is made with make ci20_mmc config.

Hi,

Every time I try to boot from the SD Card, the blue LED lights up and the CI20 copies the SD Card to the onboard flash.

This isn't what I want -- I want to boot and run Linux from the SD Card.

Am I missing something obvious? Do I need to install a custom bootloader onto the SD Card?

I've noticed a couple of issues when trying to compile the ci20-v2013.10
branch of CI20 U-Boot with GCC 5.2.

These issues were already fixed in the upstream U-Boot.

I would suggest that you cherry-pick the following changes from
upstream U-Boot:

commit b11c5d1dc29e81326d1215011d19377737082aeb
Author: Daniel Schwierzeck <[email protected]>
Date:   Wed Jul 1 16:36:43 2015 +0200

    MIPS: change 'extern inline' to 'static inline'

    The kernel changed it a long time ago. Also this is now broken
    on gcc-5.x.

    Reported-by: Andy Kennedy <[email protected]>
    Signed-off-by: Daniel Schwierzeck <[email protected]>

commit 478b02f1a7043b673565075ea5016376f3293b23
Author: Hans de Goede <[email protected]>
Date:   Sat Feb 7 22:52:40 2015 +0100

    Add linux/compiler-gcc5.h to fix builds with gcc5

    Add linux/compiler-gcc5/h from the kernel sources at:

    commit 5631b8fba640a4ab2f8a954f63a603fa34eda96b
    Author: Steven Noonan <[email protected]>
    Date:   Sat Oct 25 15:09:42 2014 -0700

        compiler/gcc4+: Remove inaccurate comment about 'asm goto' miscompiles

    Signed-off-by: Hans de Goede <[email protected]>

commit 3422299dc28fa8257677d03cc1253e3c9bf17e9f
Author: Jeroen Hofstee <[email protected]>
Date:   Thu Jun 26 20:18:31 2014 +0200

    common: main.c: make show_boot_progress __weak

    This not only looks a bit better it also prevents a
    warning with W=1 (no previous prototype).

    Signed-off-by: Jeroen Hofstee <[email protected]>
    Acked-by: Simon Glass <[email protected]>

What do you think?

The build of branch dev-mips-kitkat-v2013.10 fails, so it is not possible to create an Android SD Card.
I manually retraced the respective commands from the mksdcard script (see CI20_android repo) and got the following output: http://pastebin.com/Dqb2BMfx

My procedure:

• add [...]/android/system/prebuilts/gcc/linux-x86/mips/mipsel-linux-android-4.6/bin to Path (also tried 4.7)
• set CROSS_COMPILE to mipsel-linux-android
• make distclean
• make ci20_mmc_config
• make

Would be nice to also update CI20_u-boot per @clopez patch:

• MIPS/CI20_linux@ec6e5ba

I know that this not a proper issue, but may be useful for others: do you know it there is a way to use the OTG usb of CI20 as serial for console (both u-boot and kernel)? I see something similar on some TI boards or ST-Ericsson board.

This would be helpful for people that don't want (or can't) to use the TTL serial.

The factory default u-boot on NAND cannot load a kernel from SD Card.

The mmc commands just hang.