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RE: RedBoot: fis create can't find free space



On 26-Apr-2001 Grant Edwards wrote:
> 
> I'm trying to figure out why the flash code in RedBoot can't
> create an image:
> 
>     RedBoot> load -v -b 0 -r -h 10.0.0.2 socket-1.03.bin
>     -
>     Raw file loaded 0x00000000-0x0007f958
>     RedBoot> fis list                      
>     Name              FLASH addr   Mem addr    Length      Entry
>     point
>     FIS directory     0x053F0000   0x053F0000  0x00010000  0x00000000 
>     default           0x051B0000   0x00000000  0x00080000  0x00000384
>     RedBoot> fis free                      
>       0x050B0000 .. 0x05130000
>       0x05230000 .. 0x053F0000
>     RedBoot> fis create foo                                          
>     Can't locate 524288 bytes free in FLASH
>     RedBoot>                              
> 
> Firstly, according to "fis list" and "fis free" I've got almost
> 2M of free space between 0x5230000 and 0x53f0000, but "fis
> create" can't find 500K of free space.  Any ideas why?
> 
> Secondly, I think I've figured out why there's "unfree" flash
> (5030000-50B0000 and 5130000-51B0000))that isn't being used by
> an image.
> 
> If I do an "fis create" with an existing image name, that will
> leak flash, right?  By "leak" I mean it leaves orphaned "used"
> areas in flash that don't belong to any image.  Is that a
> useful feature?  I'm thinking of changing the "create" code so
> that doing a "create" with an existing image name deletes the
> old one before creating the new one.  I could just tell my
> users never to do an "fis create" with an existing image name,
> but we all know how well instructions like that are followed.
> 

There is no positive relationship between 'fis free' and 'fis list'.
The "free" command simply looks for erased blocks.

'fis create' will gladly reuse existing flash space, but it must
match in length.  If you need to recreate with a different size,
you should delete and then create.


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