On Jul 9, 2008, at 7:44 PM, Josh Boyer wrote:
On Thu, 10 Jul 2008 06:39:39 +1000
Benjamin Herrenschmidt <[EMAIL PROTECTED]> wrote:
On Wed, 2008-07-09 at 16:22 -0400, Josh Boyer wrote:
On Thu, 10 Jul 2008 06:02:38 +1000
Benjamin Herrenschmidt <[EMAIL PROTECTED]> wrote:
On Wed, 2008-07-09 at 15:44 +0200, Stefan Roese wrote:
This patch enables 32bit PPC's (with 36bit physical address
space, e.g.
IBM/AMCC PPC44x) to run with more than 2GB of RAM. Mostly its just
replacing types (unsigned long -> phys_addr_t).
Tested on an AMCC Katmai with 4GB of DDR2.
Signed-off-by: Stefan Roese <[EMAIL PROTECTED]>
But DMAs will break no ?
How?
Hrm... forget it. It's fine up to 4G of RAM... (ie. as long as DMA is
below 32 bits).
Right. We haven't really dealt with anything larger than 4 GiB, and
we
certainly aren't dealing with discontiguous DRAM due to I/O ranges.
Are you *sure* you can see all 4GB? I thought we lost some of the 32-
bit PCI address space for PCI IO...... Disclaimer: I'm no expert on
PCI :)
FYI, I'm *very* close to having swiotlb fully functional on powerpc to
support larger RAM - I am able to boot with 6GB on 8641 right now.
There are some bugs that I'm still shaking out - I hope to push this
out in the next couple of weeks.
Cheers,
B
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