Frank,
I normally do my development with "mem" parameter set to 120M. I do
not see any crashes in my system. I tested USB transfers by setting the "mem"
parameter to 112M and it worked fine for me.
Regards
Swami
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-----Original Message-----
From: Frank Xue [mailto:[EMAIL PROTECTED]
Sent: Thursday, June 05, 2008 2:54 PM
To: davinci-linux-open-source
Cc: Subbrathnam, Swaminathan; Michael Gao
Subject: Re: USB CPPI DMA patch for DaVinci
All,
I'm testing USB driver with DMA support. My custom board have 256M
DDR memory.
When i set mem=112M in bootargs, USB works well with DMA mode. When i
set mem=120M,
kernel boot ok, but USB driver crashed while writing. I thought it
caused by system memory map.
we know 0x800000000-0x87800000 (120M) reserved for linux on DVEVM
default memory map.
It seems usb should work when mem=120M passed to bootargs. I'm not sure
this issue may be a
bug in the usb driver.
Any thoughts on that? Thank you!
Frank
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