e7500 flash

steven james pyro at linuxlabs.com
Sat Nov 2 18:21:01 CET 2002


I have the datasheet for that, but not an actual chip.
It looks similar to Intel FWH, except that there is no software block
locking, and there is a 4K sector erase command.

It is worth noting that there are 2 write protect pins on the device. One
for the boot (top) block, and one for the rest.

On the Clearwater board, the boot block is protected by a jumper, and the
rest is connected to GPIO.

If all else fails, you could tie those two pins high to unprotect, but
that is a bit ugly and not good in production.


On Sat, 2 Nov 2002, Andrew Ip wrote:

> James,
> > Which board are you using? The setpci enebles writes in the chipset, but
> > the 82801ca has erase/write protect pins as well that are usually wired to
> > a GPIO line from the superio or to a jumper.
> I think it is a oem board, so I don't know where it is from.  I did make sure 
> the bios write jump is set, and setpci -d 8086:2480 4e.b=1.  BTW, this board is
> using SST 49LF004 as bios flash.  If I can backup the original bios, I can also
> try the 49LF004.
> -Andrew

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