BIOS flash write doesn't seem to work on Elite eval board

Posted on November 05, 2003 at 11:03

This topic has been closed for replies.

Visitor II

Posted on November 05, 2003 at 07:43

I'm having trouble writing to the BIOS flash on the development board.

I use

mio m8 ffff0000 0

but don't see any write strobes on the Bios flash device.

Even after using

mio dx8 22 51 4

to enable ROM writes,

mio m8 ffff0000 0

doesn't result in any write strobes.

Reading the bios works fine.

This is on the Elite development board, running linux (Redhat 7.1).

Have I missed something ?

Replying to myself - yes !

I've modified the linuxbios flash_rom program to

continuously do the flash ident accesses.

This is write, write, write, read, read, write in a loop.

MEMWR is busy with no gaps,

MEMRD has nothing (except for the refresh cycles).

Perhaps it is a shadowing problem ?

[ This message was edited by: pjhf on 05-11-2003 12:46 ]

Visitor II

Posted on November 05, 2003 at 11:03

It's a bug in the freebios code I was using to access the flash.

A missing volatile allowed the C compiler to reorder the flash

accesses so that the ident wasn't read properly.

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