[Lenny400] [Mipsbook-devel] Squeeze rootfs and modernising the kernel

[Dr. H. Nikolaus Schaller]

Hi Riccardo,

Am 01.04.2015 um 09:30 schrieb Riccardo Mottola <multix at gmail.com>:

> Hi guys,
> 
> I read only the forwarded message!
> 
> I still have my Letux 400.. and given some advance in the GNUstep libraries, I wanted to give it an update and see if everything still runs. Since I'm injured, I had much more hacking time :)
> 
> I still miss a better kernel & OS than what I have now (Debian with FPU emulation.. which sucks)
> 
> http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/mipsbook-devel
> 
> Archives are not accessible.
> 
> Nice to know someone wants to pick up work. Are you thinking to update the kernel first? Nikolaus said there is some Jz support in the kernel now, but not for our older CPU.

I think the most critical part is the kernel since newer OS (like Debian Squeeze or Jessie) require at least a 3.2 kernel.

About CPU-Support I know that a lot of work had been done only for the jz4740. You can see here:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/arch/mips/jz4740?id=refs/tags/v4.0-rc6

But there is no jz4730 subdirectory…

I don’t know how well the old 2.6 cpu support fits into the 4.0 kernel environment:

http://git.goldelico.com/?p=letux-400.git;a=tree;f=arch/mips/jz4730;h=e3f9de9c61d49701563823e1ed50be5c19579d91;hb=HEAD

So a first test could be to merge this subdirectory into the 4.0 kernel tree, add some Kconfig and other quirks and try to make it compile.
Well, making it boot will become the real challenge.

Further work would need to port these things (character devices, i2c) to their modern driver variants:

http://git.goldelico.com/?p=letux-400.git;a=tree;f=drivers/char/jzchar;hb=af98662a1c30f691ab9d05604a03bf6e213b6c57
http://git.goldelico.com/?p=letux-400.git;a=blob;f=drivers/i2c/busses/i2c-jz47xx.c;h=82358ab0ec8c0bf4d497c74ca4225dff233e75d3;hb=af98662a1c30f691ab9d05604a03bf6e213b6c57

BR,
Nikolaus
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