-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 >> +/* >> pci_write_config8(dev, 0x04, 0x07); >> pci_write_config8(dev, 0x0d, 0x20); >> pci_write_config32(dev,0x10,0xd8000008); >> pci_write_config32(dev,0x14,0xdc000000); >> - >> +*/ > > History.
Aha and in raminit.c it looks like some hardcoded bars too :/ >> // set up performnce counters for debugging vga init sequence >> //setup.lo = 0x1c0; // count instructions >> //wrmsr(0x187,setup); >> @@ -254,6 +258,7 @@ >> ramregs[i]); >> } >> printk_debug("I would set ram size to 0x%x Kbytes\n", >> (rambits)*16*1024); >> +//it looks like one set 32MB of VGA? >> tomk = rambits*16*1024 - 32768; >> /* Compute the top of Low memory */ >> tolmk = pci_tolm >> 10; > > Anything else than 32mb and it dies a horrible death later on when linux > tries to use the disks. Hm looks familiar to me. Maybe it dies when the DMA is done to the buffer which is located in low mem in the 0xA0000 - 0xF0000 region? Maybe the framebuffer will just change where the DMA buffers gets allocated... Or it is some other bug ;) Does your linux use 640-1MB region as normal RAM? > Direct fb access allows any access to the framebuffer on the unichrome > to be intercepted by the memory controller. Unichrome and memory > controller are on the same die here, and since the unichrome uses part > of main ram for its memory, any access to the unichrome memory would > mean requests being made from the unichrome to the memory controller. > Without direct fb access, a lot of on chip bandwidth is effectively > thrown away sending fb accesses back and forth. Ok, so we can live without it for now and then re-enable it later maybe with some intelligent resource handling. Thank you, Rudolf -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAktBIGgACgkQ3J9wPJqZRNVslQCdFG5yhBXQ/2Q8Y1EPYU39YlD1 PTIAn3qycXh//BHP9RKxGE7KrsTnror2 =wIcG -----END PGP SIGNATURE----- -- coreboot mailing list: coreboot@coreboot.org http://www.coreboot.org/mailman/listinfo/coreboot