[ECOS] Update on Axiom CME555 Redboot FLASH Memory Problems

Andrew Lunn andrew@lunn.ch
Fri Aug 31 06:51:00 GMT 2007

On Thu, Aug 30, 2007 at 12:15:34PM -0500, Mike Pashea wrote:
> 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?

Please could you submit a patch.


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