On 05/02/2013 12:05:42 PM, Yoder Stuart-B08248 wrote:
Kumar,
In fsl_pci.c there is a change you made a while back:
"powerpc/fsl: Setup PCI inbound window based on actual amount of
memory"
...and there is this comment in the code:
/* PCIe can overmap inbound & outbound since RX & TX are
separated */
if (early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP)) {
You are implying that PCIe can overmap and PCI can't. Why is
that? (I'm assuming that 'overmap' means that inbound window
can extend beyond the end of ram.)
Shouldn't the concern be whether we're overlapping outbound, not merely
whether we go beyond the end of RAM?
And couldn't inbound/outbound overlap be an issue even on PCIe, if
there's a PCI bridge underneath it?
-Scott
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