[U-Boot-Users] Stack Size for MPC8xx???

Steven Scholz steven.scholz at imc-berlin.de
Sat Oct 18 15:24:32 CEST 2003

Hi there,

does someone know how big the stack is for an MPC8xx based boards?

I had this problem:

I started porting U-Boot to my new AT91RM9200 based board. After doing the flash 
code I tried "saveenv". Simple reading, writing and erasing was working. But the 
board crashed when doing "saveenv".

I found these lines in common/env_flash.c:

int saveenv(void)
         ulong   flash_offset;
         uchar   env_buffer[CFG_ENV_SECT_SIZE];
         /* copy old contents to temporary buffer */
         memcpy (env_buffer, (void *)flash_sect_addr, CFG_ENV_SECT_SIZE);

I have CFG_ENV_SECT_SIZE = 64K and CFG_ENV_SIZE=4K and realized that my stack 
was far to small to save an 64KB flash sector.

The funny thing is that I never worried about that issue. And it never seems to 
be a problem on our MPC8xx based boards...


Steven Scholz

imc Measurement & Control               imc Meßsysteme GmbH
Voltastr. 5                             Voltastr. 5
13355 Berlin                            13355 Berlin
Germany                                 Deutschland
fon: +49 30 467090-0                    Tel: 030 / 467090-0
fax: +49 30 4631576                     fax: 030 / 4631576

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