[Letux-kernel] [PATCH 00/20] A bunch of JZ4730 fixups for letux-kernel

[H. Nikolaus Schaller]

Hi Paul,

> Am 17.12.2020 um 23:49 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
> 
> So I'll either try Jessie or have to look where the Lenny image is.
> It is quite likely that I can then boot to some console prompt.

Yes, that did the trick. You obviously can't run Bullseye on a v2.6 kernel
or Lenny on a v5.10 kernel...

> And as soon as I have this I can just dmesg | fgrep mmc to check
> all mmc activities of the 2.6 kernel.
> 
> Tomorrow is a new day :)

So by using https://download.goldelico.com/letux-400/20110208-lenny400/bootstrapped-rootfs.tbz
I was able to boot the newly compiled v2.6 kernel to a screen/keyboard console login
(still no serial console but doesn't matter any more) and filter dmesg for the register values
at the end of jz_mmc_probe(). Result is attached.

Then, using a different SD card with Bullseye and the 5.10 kernel and the serial console I could
get the same register listing from the end of jz4740_mmc_probe(). Comparison shows some differences
we can now analyse.

Mainly here are bigger diffs in gpio, almost none in dmac (since it is not used) and some in msc:
10021008
1002102c
10021030

BTW: thank you very much for your memory map in our wiki! I took base address and
range from there to read out the gpio, msc, dmac sections. If anything else is
missing it is just a matter of minutes to repeat.

So I think I have now a tool setup to compare working and work-in-progress kernels.

BR and thanks,
Nikolaus

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