https://bugs.freedesktop.org/show_bug.cgi?id=83708
--- Comment #9 from Jack <zduo006 at 163.com> --- I solved that problem by use readl()/writel() func to access cpu virtual address insteand of set address directly. such as use readl(&msg[1]) instead of msg_type=msg[1]. and use the l/b endian transfer. But the new error ocurred (error message) . radeon:GPU lockup cp stall for ... more than... I try to change the lockup timeout to longer but no use. I don't know why?? -- You are receiving this mail because: You are the assignee for the bug. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/dri-devel/attachments/20140920/a3ab2b7e/attachment.html>