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Update on Axiom CME555 Redboot FLASH Memory Problems


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 haven?t 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 29LV400?s are used instead of the 29LV200?s 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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