EBC peripheral, access causing Machine Check

[Dave Cogley]

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

mailto:dcogley at uslinc.com

 

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