Comment # 56 on bug 26891 from Ludovic Watteaux

Same here Linux 3.9.0-rc4
[    5.800732] [drm] Initialized drm 1.1.0 20060810
[    5.835989] [drm] radeon kernel modesetting enabled.
[    5.839889] [drm] initializing kernel modesetting (TURKS 0x1002:0x6741
0x106B:0x00E2).
[    5.840512] [drm] register mmio base: 0xB0800000
[    5.840520] [drm] register mmio size: 131072
[    5.840667] [drm:radeon_get_bios] *ERROR* Unable to locate a BIOS ROM
[    5.840687] [drm] radeon: finishing device.