[ECOS] Best way to do a flash memory dump to host from target?

Gary Thomas gary@mlbassoc.com
Wed Mar 30 06:38:00 GMT 2005


On Tue, 2005-03-29 at 12:38 -0800, Andrew Greenberg wrote:
> Hi all,
> 
> I've got RedBoot running in RAM on a remote target and before I write a ROM 
> version to flash I'd like to capture the existing flash memory so I can "go 
> back" if I ever want to.
> 
> 1. the stock RedBoot I built doesn't seem to have any facilities for this; 
> there's 'load' which allows me to load in file via x/y modem, but is there 
> a package I can add that will give me a 'send' so that I can send a memory 
> chunk via x/y modem back to the host?
> 
> 2. I can do a minicom capture of dump -b <address> -l <length> -s which 
> will give me the s-record listing and then use objcopy to convert that to a 
> binary... but yeech, that's a twisted way to get it.

Why convert it at all?  If you want to reload it, the 'load' command 
understands S-records.  Using the -b option, you can relocate the data
to RAM for programming to the FLASH.

> 
> 3. Finally, it looks like in gdb I can say 'dump binary memory <filename> 
> <start address> <stop address>. I've done this a few times, and it seems 
> like it works, but I often get error message from gdb about invalid packets 
> which makes me a bit worried that the data is being corrupted. Is this what 
> most people do?

You shouldn't get errors from GDB.  If they are repeatable (even
somewhat), a trace would be good to see.

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