[Lenny400] LetuxOS on SD card for MIPS JZ4780 CI20
H. Nikolaus Schaller
hns at goldelico.com
Thu Apr 18 19:17:12 CEST 2019
> Am 18.04.2019 um 19:08 schrieb Paul Boddie <paul at boddie.org.uk>:
> On Thursday 18. April 2019 18.25.36 H. Nikolaus Schaller wrote:
>>>> (nc) red USB +5V - BTW: it should be possible to connect to pin 2/4 and
>>>> power the board through the FTDI USB...
>> Yes, it works to power the board through the FTDI adapter so that I only
>> need one cable :
> Interesting! This would be quite convenient.
>> I spent some more minutes and it looks as if the official u-boot source
>> recommended here
>> does not support device tree at all. Which U-Boot are you using on SD card?
>> Where did you get it from or how did you build it?
> I guess it's the same thing:
> Branch ci20-v2013.10 from the above repository.
> When I looked into this, I made the quick choice of just fixing up the
> problems in that code that modern compilers experience (like compiling older
> Linux kernels)
I have added one patch for Letux cross-compilation:
> rather than trying to introduce CI20 support into the upstream
> U-Boot. I imagine that the developers just gave up with the upstreaming of
Most likely... But how should we run a device-tree kernel now?
It does not look as if there is a MIPS pendant to CONFIG_ARM_APPENDED_DTB.
Android seems to have that:
Well, there is always the option to manually do the append. But I am not sure
if the MIPS kernel is searching for it...
Or should we backport a newer bootm command? That may not be easy as it assumes
a standard to pass the DTB address to a kernel and that might not be in the old
So we are a little stuck here. Ideas are welcome!
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