https://bugzilla.kernel.org/show_bug.cgi?id=33542

Summary: radeon: Don't read BIOS in VRAM on SPARC64 Product: Drivers Version: 2.5 Kernel Version: 2.6.39-rc3 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Video(DRI - non Intel) AssignedTo: drivers_video-dri@kernel-bugs.osdl.org ReportedBy: detringj@gmail.com Regression: No

Created an attachment (id=54572) --> (https://bugzilla.kernel.org/attachment.cgi?id=54572) DRM and Radeon dmesg block containing kernel panic.

Hi!

Hurray! Radeon KMS works again on SPARC64! Almost.

Test platform is a Sun Ultra 45. Test board is a Sun XVR-300 (RV380 0x1002:0x5B64) on a PCI-e bus.

There's a kernel panic when calling igp_read_bios_from_vram() from radeon_get_bios(). See attached dmesg capture.

Patching around it with

--- a/drivers/gpu/drm/radeon/radeon_bios.c 2011-04-17 19:31:04.000000000 -0500 +++ b/drivers/gpu/drm/radeon/radeon_bios.c 2010-09-28 20:01:22.000000000 -0500 @@ -432,8 +432,10 @@ uint16_t tmp;

r = radeon_atrm_get_bios(rdev); +#if !defined(__sparc__) if (r == false) r = igp_read_bios_from_vram(rdev); +#endif /* !__sparc__ */ if (r == false) r = radeon_read_bios(rdev); if (r == false) {

gives me a framebuffer console again. After which, the usual desktop stack works as well (X11, mesa, textured video).

I'm not sure this is the correct way to code the fix, stylistically speaking. Although I don't know of any sparc64 machines sporting a Radeon IGP, I'm sure it could happen someday. It also seems other architectures might run into this as well.