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

[Andreas Kemnade]

On Fri, 9 Feb 2024 21:53:04 +0100
Andreas Kemnade <andreas at kemnade.info> wrote:

> On Fri, 9 Feb 2024 18:10:49 +0100
> "H. Nikolaus Schaller" <hns at goldelico.com> wrote:
> 
> > > I have debugged several other emmc/sd problems on other boards this way.    
> > 
> > I agree that it can work but IMHO setting it up is quite a distraction
> > and in the saved time the problem can be analysed by different methods.
> > 
> > But we can of course work in parallel - and one method will find the bugs.
> >   
> something interesting seen:
> while typing in commands in the shell.
> 
> ke[    0.000191] mmc0: host does not support reading read-only switch, assuming 
> write-enable
> [    0.000191] mmc0: new high speed SDHC card at address 59b4
> [    0.000191] mmcblk0: mmc0:59b4 SN32G 29.7 GiB
> [    0.000191]  mmcblk0: unable to read partition table
> [    0.000191] mmc0: card 59b4 removed
> r[    0.000191] mmc0: host does not support reading read-only switch, assuming write-enable
> [    0.000191] mmc0: error -145 whilst initialising SD card
> 
> and endless errors again...
> 
but only for mmc1.

tried again with setting bus-width to 1 and I got immediately:
[    0.000192] jz4740-mmc 13460000.mmc: Ingenic SD/MMC card driver registered
[    0.000192] jz4740-mmc 13460000.mmc: Using DMA, 4-bit mode
[    0.000192] Freeing unused kernel image (initmem) memory: 1316K
[    0.000192] This architecture does not have kernel memory protection.
[    0.000192] Run /sbin/init as init process
[    0.000192]   with arguments:
[    0.000192]     /sbin/init
[    0.000192]   with environment:
[    0.000192]     HOME=/
[    0.000192]     TERM=linux
[    0.000192] process '/bin/busybox' started with executable stack
^Mcan't run '/etc/init.d/rcS': No such file or directory

Please press Enter to activa[    0.000192] jz4740-mmc 13460000.mmc: no support for card's volts
te this console. [    0.000192] mmc1: error -22 whilst initialising SDIO card
[    0.000192] mmc0: host does not support reading read-only switch, assuming write-enable
[    0.000192] mmc0: new high speed SDHC card at address 59b4
[    0.000192] mmcblk0: mmc0:59b4 SN32G 29.7 GiB
[    0.000192]  mmcblk0: unable to read partition table
[    0.000192] mmc0: card 59b4 removed

and silence besides of mmc1 errors.

Regards,
Andreas