[coreboot] [LinuxBIOS] W39V040BPZ or vt8237. Flashing problems.

Carl-Daniel Hailfinger c-d.hailfinger.devel.2006 at gmx.net
Tue Mar 4 04:53:47 CET 2008

Hi Yinghai,

I am seeing problems with Winbond W39V040B and MCP51. It seems these 
problems are probably related to LPC timing. Did you check the MCP51 
datasheets for LPC timing and flashing when you were at AMD?

On 04.03.2008 01:15, Peter Stuge wrote:
> On Mon, Mar 03, 2008 at 06:42:05PM -0500, Corey Osgood wrote:
>>> If I hot-unplug the flash chip and hot-replug it, it is recognized
>>> again. Reading it shows the erase was successful, but once I try
>>> to program even one byte, communication with the flash chip fails
>>> completely and I have to unplug and replug to fix that.
>> I'm seeing exactly the same thing with the cn700+vt8237r on Jetway
>> J7F2W, same flash chip, except that where it hangs seems random.
> I take this to mean that 8237 and the W39V040BPZ aren't really
> compatible.
> I would investigate if the timing for the two is compatible on paper.
> Also, maybe the 8237 has some speed setting like the ITE.

The interesting thing is that the chip is the factory installed chip and 
flashing it should (not yet tested) work fine with the vendor flash tool.



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