[coreboot] [PATCH] Changes for DLP 1232H external programer to Flashrom
peter at stuge.se
Sun Jun 28 16:29:40 CEST 2009
Jakob Bornecrantz wrote:
> Unfortunately it seems to have problems writing to the chip.
Hm. So would need a lot more debugging added for SPI in flashrom I
> I have some pictures of the programer here:
I suggest shortening all wires as much as possible, signal wires
under 3cm, you could make it so that the blue/white deck is upside
down when the connector is attached to the board. Ie build wires to
the connector straight up, so the connector is above the FTDI chip
with solder side towards the chip.
As for the speed, just check that the chip you're driving can go as
fast as you want. It might also make sense to use the same speed as
the SPI master on the EPIA board, because the EPIA PCB could be
optimized for that speed, but all "lower" speeds should work OK,
say 10MHz or below..
Keeping the wires short is always important. I had trouble with
Macronix flash which was very sensitive to noise on some lines. Only
worked properly once I got wire length down.
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