Re: Linux instrumentation for new loader

[Arthur Marsh]

Arthur Marsh wrote, on 01/07/09 03:21:
> Robert Millan wrote, on 01/07/09 00:10:
> > These patches might be helpful in case someone runs in trouble with the
> > new loader.  They instrument Linux to obtain a screen_info structure 
> > dump,
> > which can be used to compare the output of "linux16" vs "linux".
>
> This is with a Radeon 9200SE [RV280], which I think has 128 MiB of RAM.
>
> I applied these to a kernel 2.6.30 and built and installed the kernel.
>
> I set vga=0x311 on the linux command line
>
> linux16 gave me a dump in green text and went no further:
>
> all typos and omissions (usually because values were 0x0) are mine:
>
> orig_x = 0x0 orig_y = 0x4
>
> ext_mem_k = 0xffc0
> video_mode = 0x3
> cols = 0x50
> egabx = 0x3
> wnes ? = 0x19
> points = 0x10
> 640x480x16
> fb_base = 0xd8000000
> fbsize = 0x100
> fb_line_length = 0x500
> red size 0x5 red pos 0xb
> green size 0x6 green pos 0x5
> blue size 0x5 blue pos 0x0
> reserved size 0x0 pos 0x0
> vesapm  0xc000:0x57aa
> pages 0x18
> vesa attr 0xbb
>
> linux told me to set vgamode=640x480x16;640x480 then that it was booting 
> anyway, no dump of screen_info
>
> when I tried booting with:
>
> set vgamode=640x480x16;640x480
>
> I received the error message about 640x480 not being a recognised command.
>
> Regards,
>
> Arthur.

when using linux instead of linux16, the differences I noted were:

Firstly, linux shows the text white, with a press any key to continue 
message.

linux16 showed the text green, and locked up, when I pressed any keys.

On the linux boot:

org_y = 0x9
ext_mem_k = 0x8000
egabx = 0x0
width / height / depth 0x0x0
lfb_base 0x0
lfbsize = 0x100
cloffset = 0x1000
clfb line length = 0x0

then everything from red-size onwards being 0x0.

Arthur.