Want to run L4Re on Raspberry PI.

[Paul Boddie]

On Tuesday 11. June 2019 00.18.43 Paul Boddie wrote:
> On Tuesday 11. June 2019 00.08.59 Adam Lackorzynski wrote:
> > If it just reboots in the middle of a rather normal C function, then
> > it's likely some instruction that has been generated there and not
> > understood by the CPU. Could you maybe use u-boot as it shows a register
> > dump when something like this happens, allowing to know where it
> > branched away.
> 
> I think that introducing U-Boot may save me some time in the end, so I'll
> look into that. The Raspberry Pi stuff is rather alien to me, but I had
> hoped that there was an established recipe for getting things up and
> running.

Well, with config.txt updated with...

kernel=u-boot.bin

...I get a prompt on the UART and can tell U-Boot to load and start the 
payload, according to some instructions I found online:

https://ltekieli.com/buildroot-with-raspberry-pi-u-boot/

Here is the conversation:

----

U-Boot> mmc dev 0
switch to partitions #0, OK
mmc0 is current device
U-Boot> fatload mmc 0:1 ${kernel_addr_r} hello.raw
1209560 bytes read in 91 ms (12.7 MiB/s)
U-Boot> bootz ${kernel_addr_r}
Kernel image @ 0x080000 [ 0x1000000 - 0x11274d8 ]

Starting kernel ...


L4 Bootstrapper
  Build: #8 Mon Jun 10 19:44:17 CEST 2019, 7.4.0
  Scanning up to 512 MB RAM, starting at offset 32MB
  Memory size is 512MB (00000000 - 1fffffff)
  RAM: 0000000000000000 - 000000001fffffff: 524288kB
  Total RAM: 512MB
  Scanning fiasco
  Scanning sigma0
  Scanning moe
  Moving up to 5 modules behind 1100000

----

Unfortunately, nothing more is shown and there is no register dump. Maybe I 
have to compile in some kind of exception handler or something.

Paul