From: "J.O. Aho" <[email protected]>
Date: Sun, 11 Dec 2005 00:22:22 +0100 (CET)
> sbusfb_mmap: start[71800000] size[410000] off[4000000]
> sbusfb_mmap: page[0] map_size[2000]
> sbusfb_mmap: map_size is now 2000
> IO[X:6712]:
> remap_pfn_range(s[71800000]e[71c10000],f[71800000],pfn[1fc0060],sz[2000],prot[80000000000006b0])
> sbusfb_mmap: page[2000] map_size[2000]
> sbusfb_mmap: map_size is now 2000
> IO[X:6712]:
> remap_pfn_range(s[71800000]e[71c10000],f[71802000],pfn[1fc0060],sz[2000],prot[80000000000006b0])
This is the trace we needed.
That last line is impossible, the debugging of the last 3 lines shows
that:
1) "page" is equal to 0x2000
2) "map_size" is equal to 0x2000
Furthermore, the first line shows that:
3) "vma->vm_start" is 0x71800000
The io_remap_pfn_range() call in drivers/video/sbuslib.c is:
r = io_remap_pfn_range(vma,
vma->vm_start + page,
MK_IOSPACE_PFN(iospace,
map_offset >> PAGE_SHIFT),
map_size,
vma->vm_page_prot);
This means, it passes in "vma->vm_start + page" in as the start
address.
Yet the last line, printed by the tracing code in io_remap_pfn_range()
is getting 0x71800000, when it should be 0x71802000.
I strongly believe your kernel is being miscompiled by whatever
gcc is being used to build your kernels.
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