[coreboot] coreboot 4.4 release coming soon

ron minnich rminnich at gmail.com
Wed Apr 20 20:28:50 CEST 2016


On Wed, Apr 20, 2016 at 10:21 AM Jonathan Neuschäfer <j.neuschaefer at gmx.net>
wrote:

>
> I can get coreboot to boot in QEMU up to the "payload not loaded"
> message with a few patches:
>  - I patched QEMU to not trap unaligned memory accesses
>

we're supposed to handle these traps, so something is broken. I would only
trust spike however.



>  - I patched coreboot to use the HTIF console instead of a 8250 UART
>    memory-mapped at 0x3f8.
>

I suspect htis means the qemu or qemu target is still out of date, but who
knows.

>    - Both the write_msr(tohost, ...) interface and the memory-mapped
>      HTIF at 0xFFFFFFFFF0000000 work.
>

good.


>  - I patched QEMU to dump characters written to the HTIF console,
>    because I couldn't figure out how to use it properly.
>
> Coreboot fails to boot Linux (configured vmlinux as an ELF payload,
> because I couldn't find a compressed kernel):
>
>   CBFS: Locating 'fallback/payload'
>   CBFS: Found @ offset cbc0 size 136043
>   Loading segment from rom address 0x000000000002ccf8
>     code (compression=1)
>     New segment dstaddr 0x0 memsize 0x35abe0 srcaddr 0x2cd30 filesize
> 0x13600b
>   Loading segment from rom address 0x000000000002cd14
>     Entry Point 0xffffffff80000000
>   SELF Payload doesn't target RAM:
>   Failed Segment: 0x0, 3517408 bytes
>    0. 0000000000200000-0000000001fdafff: RAM
>    1. 0000000001fdb000-0000000001ffefff: CONFIGURATION TABLES
>    2. 0000000001fff000-00000000021fffff: RAM
>   Payload not loaded.
>
>

we still only do uncompressed kernels. There are other problems with riscv
right now, so I'm holding off doing anything until they are done redoing
parts of the architecture spec.

ron
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