Good Afternoon,
I am using an AMCC 440EPx processor with an FPGA peripheral attached
to the EBC. I am doing the entire bank configuration in the u-boot boot
loader before Linux is loaded. I can directly read and write registers using
memory read and write (md, nm) within area 0xC0000000 to 0xC000FFFF direct
memory I/O within the context of u-boot without any faults. When I
attempt to access any register in area 0xC000000 within the context of my Linux
device driver I get a Machine Check fault (attached text) which appears to be
an access permission violation. I am currently running the DENX ELDK 2.6.19.2
platform that was specific to the “Sequoia” platform.
I have configured the EBC access permissions and control resisters
as follows for bank 1:
PB1CR: 0xC003C000
PB1AP: 0x80040380
Dave Cogley
Software Engineer
Ultra Stereo Labs, Inc.
(805) 549-0161