[Letux-kernel] X1600 / LX16 support - here: adding MMC

H. Nikolaus Schaller hns at goldelico.com
Sat Feb 10 11:40:52 CET 2024



> Am 10.02.2024 um 11:32 schrieb Andreas Kemnade <andreas at kemnade.info>:
> 
> On Sat, 10 Feb 2024 11:11:40 +0100
> "H. Nikolaus Schaller" <hns at goldelico.com> wrote:
> 
>> Hi all,
>> 
>>> Am 09.02.2024 um 22:59 schrieb Andreas Kemnade <andreas at kemnade.info>:
>>> 
>>>> What I have as a theory is that the clocks are wrong and outside of specs. Some SD card
>>>> and some x1600 MSC may handle this well - and in some cases not.
>>>> 
>>> well, what I know about clocks:
>>> date
>>> shows something incrementing in a same way.
>>> the [....] in console do only increment in the beginning, and now I have suddenly seen 0.000193.  
>> 
>> Yes, that is some bug in the OST (Operating System Timer?) driver which is not directly related to the CGU (Clock and Gate Unit?).
>> 
> BTW:
> /sys/devices/system/clocksource/clocksource0 # cat available_clocksource 
> ingenic-ost ingenic-timer 
> 
> while running 
> BusyBox v1.30.1 (Debian 1:1.30.1-6+b3)
> 
> which has also devmem included, uImage is just at 6MB
> with that included.
> 
> -# CONFIG_BLK_DEV_INITRD is not set
> +CONFIG_BLK_DEV_INITRD=y
> +CONFIG_INITRAMFS_SOURCE="devnodes.txt root"
> +CONFIG_INITRAMFS_ROOT_UID=1000
> +CONFIG_INITRAMFS_ROOT_GID=1000
> +CONFIG_RD_GZIP=y
> +# CONFIG_RD_BZIP2 is not set 
> +# CONFIG_RD_LZMA is not set  
> +# CONFIG_RD_XZ is not set
> +# CONFIG_RD_LZO is not set   
> +# CONFIG_RD_LZ4 is not set   
> +# CONFIG_RD_ZSTD is not set  
> +CONFIG_INITRAMFS_COMPRESSION_GZIP=y
> +# CONFIG_INITRAMFS_COMPRESSION_NONE is not set
> 
> $ cat devnodes.txt 
> dir /dev 0755 0 0
> dir /proc 0755 0 0
> dir /sys 0755 0 0
> nod dev/console 0620 0 0 c 5 1
> nod dev/null 0666 0 0 c 1 3
> 
> for some reason devtmpfs (which would be initially populated) does not
> get automounted, and to avoid fiddling with these nodes as root, I use this
> file, so building initramfs works without root.
> 
> root is just bin/busybox + symlinks (including one from bin/busybox to /init
> 
> 
>> Not having that running may have a minor influence on the MMC, but I am not sure it is.
> 
> well, I am looking around for suspicious things.
> That is why I stumbled upon the led issue. Maybe I should check
> whether gpio handling works, maybe something gets not driven correctly.

Can you see /sys/class/leds? Then it should be possible to manually control
the heartbeat LED gpio.

If this works and the heartbeat isn't - then it is the same OST/HRT issue.
I am quite sure that the heartbeat uses the HRT for timing.

BR,
Nikolaus



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