Thanks for the response. Currently the processor will have 128KB of RAM. It will be running a small footprint RTOS.
This processor is sort of a co-processor which offloads the main CPU for certain tasks. It is basically replacing an FPGA as it is a cheaper solution. I will check if I can bump the RAM to 256 or 512KB.
I began to suspect it would be a sizeable effort to modify u-boot to execute from FLASH, thanks for confirming.
Regards, Mike
-----Original Message----- From: u-boot-bounces@lists.denx.de [mailto:u-boot-bounces@lists.denx.de] On Behalf Of Wolfgang Denk Sent: Monday, September 21, 2009 10:46 AM To: Mike Breneman Cc: u-boot@lists.denx.de Subject: Re: [U-Boot] Executing uboot from FLASH
Dear Mike Breneman,
In message B0A7AF226B49A14897036E9B3A68CFFECB1AB0F248@HQ-EXCH-7.corp.brocade.com you wrote:
I am working with the AMCC PPC 405Ex. I will have very limited RAM on my production board, thus I would like u-boot to execute from
How much is "very limited" ?
If you want to use that board for any reasonable pourposes, which justify the use of a boot loader like U-Boot, then you probably have more than enough RAM to run U-Boot.
FLASH rather than RAM. Has anyone else done this? I played with this a couple of days with out much success. Is it do-able, without too much effort?
It would be significant effort. And it makes not much sense, as you would lose a lot of basic functionality, resp. have to work around the resulting restrictions.
It doesn't make sense to me. Rather think how to make it fit into avilable RAM. How much RAM do you have?
Best regards,
Wolfgang Denk