Re: [9fans] Building a Raspberry Pi image / Keyboard support

[Bakul Shah <bakul@bitblocks.com>]

On Tue, 01 Jul 2014 23:01:53 PDT Anant Narayanan <anant@kix.in> wrote:
>
> 1. I'm trying to get a custom built kernel to boot but not having great
> luck, unfortunately. I got as far as "mk 'CONF=pi'" in /sys/src/9/bcm
> (those are the latest sources, correct?) which generated a 2M kernel named
> 's9pi'. I added that to the FAT partition on the standard 9pi SD card image
> and edited config.txt to point to it. Now, when I boot I see a rainbow
> pattern screen -- switching back to the 9pi kernel in config.txt makes it
> boot again.

mk should've created 9pi and s9pi.  Copy 9pi to the fat partition, not s9pi.

> What am I doing wrong?

The RPi boot program doesn't know about plan9 executables. It
will just copy the bits from the kernel file specified in
config.txt at address 0x8000 and jump there. See 9/bcm/words
for some details.

> 2. A couple of my keyboards don't work with the standard kernel on the SD
> card (the mouse works fine). Is /sys/src/omap/usbehciomap.c the right place
> for me to start looking into adding support for them?

This thread may help:

https://groups.google.com/forum/#!topic/comp.os.plan9/ycok6NTCWCg

Ideally you shouldn't need more than create a custom kbmap file.