Hi,
I have a video card with a small iommu (in an intel poulsbo) who needs
to have an PCI resource address aligned to 256M.
00:02.0 VGA compatible controller: Intel Corporation System Controller
Hub (SCH Poulsbo) Graphics Controller (rev 07) (prog-if 00 [VGA
controller])
...
Region 0: Memory at fdf00000 (32-bit, non-prefetchable) [size=512K]
Region 1: I/O ports at ff00 [size=8]
Region 2: Memory at d8000000 (32-bit, non-prefetchable) [size=128M]
Region 3: Memory at fdfc0000 (32-bit, non-prefetchable) [size=128K]
...
The driver get the address by
pg->gatt_start = pci_resource_start(dev->pdev, PSB_GATT_RESOURCE); with
PSB_GATT_RESOURCE=2
and test it here :
if (pg->gatt_start & 0x0FFFFFFF) {
DRM_ERROR("Gatt must be 256M aligned. This is a
bug.\n");
ret = -EINVAL;
goto out_err;
}
The only 'place' where the resource can be aligned to 256M is at
0xe0000000 who is reserved by 'pnp'
How can i 'move' this region to 0xe000000 ?
Thanks,
Jean.
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