thanks for investigation . With "Legacy BIOS/CSM compatibility is enabled" my dmesg output is dmesg|grep -i drm radeondrm0 at pci1 dev 0 function 0 "ATI Radeon HD 8730M" rev 0x00 drm1 at radeondrm0 radeondrm0: msi inteldrm0 at pci0 dev 2 function 0 "Intel HD Graphics 4000" rev 0x09 drm0 at inteldrm0 inteldrm0: msi inteldrm0: 1600x900, 32bpp wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation) error: [drm:pid0:cpt_set_fifo_underrun_reporting] *ERROR* uncleared pch fifo underrun on pch transcoder A error: [drm:pid0:intel_pch_fifo_underrun_irq_handler] *ERROR* PCH transcoder A FIFO underrun drm:pid0:si_init *ERROR* Expecting atombios for cayman GPU drm:pid0:radeondrm_attachhook *ERROR* Fatal error during GPU init
пт, 8 февр. 2019 г. в 22:29, Joe Davis <m...@jo.ie>: > I had a similar issue when attempting to boot on an 2011 iMac with a > radeon card. I did track down the location of the bug, but I didn't get > around to reporting it. > > As far as I can tell the problem is this line (243, in -current) in > dev/pci/drm/radeon/radeon_bios.c, in the function radeon_read_bios: > > #else > bios = (u8 *)ISA_HOLE_VADDR(0xc0000); > #endif > > It makes the assumption that the system firmware has mapped the graphics > card ROM at 0xC0000. This works fine on most computers if legacy BIOS > compatiblity is enabled, but breaks on (U)EFI systems which have it > disabled or unavailable. Apple hardware for instance, if booted in EFI > mode, don't map anything to 0xC0000 and make no attempt to have legacy > BIOS compatibility unless specifically told to boot a legacy bootsector. > > I worked around it on that iMac by doing an MBR installation rather than > EFI/GPT. On other hardware, I'd recommend going into your BIOS settings > and ensuring that Legacy BIOS/CSM compatibility is enabled, and it isn't > set to UEFI-only. > > A robust fix would have the radeon_get_bios map the ROM into memory > itself instead of relying on the firmware to do it. This is how the > linux code (line 208) works. > > Cheers, > Joe > -- Dmitry Orlov
