Hi there, i m trying to understand few mechanism in coreboot can someone help ? I grabbed the git tree , made crossgcc , made a biosfile tested succesfully within qemu. In the menuconfig few options are quite confusing especially looking at the vgabios . I choose the oldest qemu model for emulation , enabled the vgabios , kept the vesa framebuffer did the edid patch to bypasse vbe mod multiple ... but i can't get my splashscreen :-/
johan@debian:~/coreboot$ file build/coreboot.rom ^C johan@debian:~/coreboot$ build/cbfstool build/coreboot.rom print coreboot.rom: 4096 kB, bootblocksize 928, romsize 4194304, offset 0x3c0000 alignment: 64 bytes, architecture: x86
Name Offset Type Size bootsplash.jpg 0x3c0000 bootsplash 50937 cmos_layout.bin 0x3cc740 cmos_layout 808 fallback/dsdt.aml 0x3ccac0 raw 4000 config 0x3cdac0 raw 3459 revision 0x3ce880 raw 569 (empty) 0x3ceb00 null 5208 fallback/romstage 0x3cff80 stage 11468 fallback/ramstage 0x3d2cc0 stage 46007 fallback/payload 0x3de0c0 payload 55823 vgaroms/seavgabios.bin 0x3ebb40 raw 35840 (empty) 0x3f4780 null 46232
I read somewhere that in vgabios i should be able to see :
under "VGA ROM ---> VGA Hardware Type" select "coreboot linear framebuffer"
Anyway i can get my os to boot , i can pass the F12 boot option , i can pass openfirmware but ... i can't even understand why with all requirement in the biosfile i could't get 1024*768 jpeg displayed with vesa enabled ... I 'm lost Thanks
Hi Johan,
The best way is to run coreboot on qemu, attach gdb to it and step through all the functions to catch the flow.
Let me know if you need any help with the setup.
Regards, Saket Sinha
On Mon, Aug 10, 2015 at 4:24 PM, Johan S johanpsz@yahoo.fr wrote:
Hi there, i m trying to understand few mechanism in coreboot can someone help ? I grabbed the git tree , made crossgcc , made a biosfile tested succesfully within qemu. In the menuconfig few options are quite confusing especially looking at the vgabios . I choose the oldest qemu model for emulation , enabled the vgabios , kept the vesa framebuffer did the edid patch to bypasse vbe mod multiple ... but i can't get my splashscreen :-/
johan@debian:~/coreboot$ file build/coreboot.rom ^C johan@debian:~/coreboot$ build/cbfstool build/coreboot.rom print coreboot.rom: 4096 kB, bootblocksize 928, romsize 4194304, offset 0x3c0000 alignment: 64 bytes, architecture: x86
Name Offset Type Size bootsplash.jpg 0x3c0000 bootsplash 50937 cmos_layout.bin 0x3cc740 cmos_layout 808 fallback/dsdt.aml 0x3ccac0 raw 4000 config 0x3cdac0 raw 3459 revision 0x3ce880 raw 569 (empty) 0x3ceb00 null 5208 fallback/romstage 0x3cff80 stage 11468 fallback/ramstage 0x3d2cc0 stage 46007 fallback/payload 0x3de0c0 payload 55823 vgaroms/seavgabios.bin 0x3ebb40 raw 35840 (empty) 0x3f4780 null 46232
I read somewhere that in vgabios i should be able to see :
under "VGA ROM ---> VGA Hardware Type" select "coreboot linear framebuffer"
Anyway i can get my os to boot , i can pass the F12 boot option , i can pass openfirmware but ... i can't even understand why with all requirement in the biosfile i could't get 1024*768 jpeg displayed with vesa enabled ... I 'm lost Thanks
-- Johan S johanpsz@yahoo.fr
-- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot
-
Johan S -
Saket Sinha