BCM2836 (Raspberry Pi 2) port

Stephen Warren [off-list ref] writes:

On 04/24/2015 12:41 PM, Eric Anholt wrote:

quoted

Stephen Warren [off-list ref] writes:

quoted

On 04/21/2015 12:09 PM, Eric Anholt wrote:

quoted

This is my first submission of a Raspberry Pi 2 port.  It can be found
at https://github.com/anholt/linux/tree/bcm2836

I'm using the 2835 interrupt controller support, without adding the
checks for ARM local interrupts first.  That means no support for IPIs
(and thus no SMP), no PMU events, and no local timer (I'm using the
same 2835 peripheral one).

It supports a similar featureset to Pi 1 at this point.  Serial and SD
cards work.  Just one CPU supported.  USB (ethernet) works if you use
U-Boot, or my mailbox series
(https://github.com/anholt/linux/tree/bcm2836-mbox).

I can't quite get this to work. I think what's happening is that U-Boot
is over-writing the location of the code/data that the CPU1..3 pin loop
uses. Do you know what that address is so I can confirm that?

I suspect this because when I load the kernel/DT in U-Boot, or when I
jump to the kernel to boot it, I see lots of extra duplicated characters
on the UART, like all 4 CPUs are booting Linux. For example:

Oops, I was just extrapolating that U-Boot would work.  I've quit using
it because of the extra configuration work (particularly the compiled
text files for the boot scripts).

You don't need any compiled text files if you create an extlinux.conf 
rather than a boot.scr. extlinux.conf is plain text.

To boot without U-Boot: Could you say what's in your config.txt? I 
assume I can just copy the kernel zImage as kernel.img, and the DTB from 
the kernel build tree without renaming it?

I've been explicitly naming the DTB in config.txt, haven't tested otherwise.
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