Hi All,
I have an update to report on the Axiom CME-555 Redboot crash that I posted
about last week.
I am certain that this is the same crash that Miguel Vega reported in
earlier posts. However, I havent seen any follow-up postings where he
described any permanent solution.
Newer Axiom CME-555 boards have twice as much FLASH as the older boards
because 29LV400s are used instead of the 29LV200s that were used when eCOS
was ported to the CME-555. Modifying am29xxxxx_parts.inl to add the LV400 is
pretty straightforward, but Redboot will crash with a segmentation fault on
startup when it tries to run load_flash_config()located in flash.c.
I found that in addition to adding the LV400 description, you also have to
change the OR1 mask in line 89 of cme555.S:
lwi r4, 0xfff80032
should be changed to:
lwi r4, 0xfff00032
The new mask prevents the MPC555 memory unit from generating a fault when
the upper half of the 29LV400 is accessed.
One stray bit can sure cause a lot of problems
Mike Pashea
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