This is the mail archive of the
ecos-discuss@sourceware.org
mailing list for the eCos project.
Re: Update on Axiom CME555 Redboot FLASH Memory Problems
- From: Andrew Lunn <andrew at lunn dot ch>
- To: Mike Pashea <mpashea at hotmail dot com>
- Cc: ecos-discuss at ecos dot sourceware dot org
- Date: Fri, 31 Aug 2007 08:51:44 +0200
- Subject: Re: [ECOS] Update on Axiom CME555 Redboot FLASH Memory Problems
- References: <BAY117-F3761D356A0FD58CDC6D8E4ACCD0@phx.gbl>
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.
Thanks
Andrew
--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss