On Fri, 18 Jun 2010 16:51:02 +0800, april aapri...@gmail.com wrote:
Hi all:
I have a problem. I want to make a command buffer in PCIE memory, and
make Engine execute those commands.
First set PCIE memory to be WC, copy command to command buffer in PCIE
memory, and make HW to execute those commands.
sometimes, the Graphic engine will hang.
I try to use mb() to clear WC buffer, it seems a little butter? But
the problem is still.
When I set the PCIE memory to Uncached, everthing is OK.
So, Is it due to the write buffer that is not evicted ?
and how to clear the WC buffer?
You need to do PCI write posting, meaning read some data out of the
target to ensure that your buffered writes actually land. You'll often
see this in the drivers as:
WRITE_REG(reg, val)
(void)READ_REG(reg)
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