On Apr 21, 2009, at 11:00 AM, Rafal Jaworowski wrote:
On 2009-04-21, at 19:04, Marcel Moolenaar wrote:
o Carve out the first 1MB of physical memory. The MPC85xx has
DMA problems with addresses below 1MB. Ideally busdma knows
how to avoid allocating below 1MB for MPC85xx, but that
requires a bit more work. For now, ignore the 1MB of DRAM.
Could you elaborate a bit on the last item? What is the faulty
scenario, is this a known h/w defect documented somewhere?
Not documented and no indication of a failure from PCI/PCI-X
or PCI Express host controllers, nor the device doing the DMA
and also not from the coherency engine on the MPC85xx.
The only noticeable behaviour is a lack of data transfer by
virtue of having unchanged memory after DMA write completion.
Observed with MPC8544 PCI, MPC8544 PCI Express and MPC8548
PCI Express.
FYI,
--
Marcel Moolenaar
xcl...@mac.com
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