Hi Dan,
Dan Snyder wrote:
I am attempting to use the hardware encryption support provided by the 5271 and
am running into this problem. (Access Error Exception when attempting to
read/write from userspace). How can I modify the kernel to allow access to
0x40000000 through 0x401b009f ?
Section 11.4 of the 5271 RM seems to be what you are looking for.
It describes the access control implemented on this part.
I have been poking through the kernel headers for hours now and I am still
clueless.
You probably won't find anything associated with this in the headers,
since the kernel doesn't generally support any of these types of
features.
I believe I need to add the address range to
/arch/m68knommu/platform/527x/config.c but I am not sure if this is correct or
exactly how to do so.
config.c would be an ok place to set this. I suspect you want
to add something like:
writeb(0x04, 0x40000030)
which sets the GPACR0 register to allows kernel and user
modes to have read/write access.
Any guidance would be much appreciated. Thank you
Regards
Greg
------------------------------------------------------------------------
Greg Ungerer -- Principal Engineer EMAIL: g...@snapgear.com
SnapGear Group, McAfee PHONE: +61 7 3435 2888
8 Gardner Close FAX: +61 7 3217 5323
Milton, QLD, 4064, Australia WEB: http://www.SnapGear.com
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