[ECOS] Re: Limit region of flash used by RedBoot for FIS?

Gary Thomas gary@mlbassoc.com
Mon Nov 6 15:02:00 GMT 2006


Andrew Lunn wrote:
> On Mon, Nov 06, 2006 at 08:51:04AM -0600, Grant Edwards wrote:
>> In gmane.os.ecos.general, you wrote:
>>
>>>> I found CYGNUM_REDBOOT_FLASH_RESERVED_BASE which specifies a
>>>> reserved area that the bottom of flash, but I can't find a CDL
>>>> option that reserves space at the top of flash.  Care to give
>>>> me a hint?
>>> CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK - default value is (-1) which
>>> puts the FIS directory in the last erase block of the device.
>>> Just set it to -(N+1), where N is the number of erase blocks that
>>> you don't want RedBoot to touch.
>> Ah. Thanks.  It wasn't apparent (at least to me) from the
>> documentation for that option that anything beyond that block
>> would be untouched.  It might be good to add that useful bit of
>> info to the comment for that option.
> 
> Im not actually sure this is true. I suggest you look carefully at the
> code before you accidental stomp over your top 1Mbyte. In fact a quick
> examination of fis_init() suggests it does erase after the end of the
> cfg/fis blocks.

If this is true - it's an oversight from when we added this support.
We certainly *wanted* it to work the way I described :-)

A patch would be appreciated if changes are required.

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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