On 29.09.2010 01:32, Peter Stuge wrote:
Carl-Daniel Hailfinger wrote:
takes slighly more time due to various calibration
routines (I could not find a way to disable those, but I didn't
try very hard),
If you already have a known-good delay function with microsecond
precision, you could use that instead of waiting for flashrom to
calibrate its own delay loop.
I'd suggest a setting which makes flashrom skip all parallel flash
chips, to remove any need for calibration.
That would break some Winbond LPC flash chips which require a few
milliseconds of delay between JEDEC toggle reads on erase.
And we also noticed that some SPI chips will react badly (corruption) to
a too tight RDSR instruction schedule.
flashrom on libpayload uses the libpayload-provided delay functions and
skips calibration. Given that LPC/FWH/SPI flash chips usually tolerate
longer than expected delays without problem, you could hook up
programmer_delay to udelay and save a second or so for calibration if
you don't need parallel flash.
(To be more precise, the deciding factor is whether
the chip is on
the local bus, or if there are some bus master(s) in between, but
that's generally equivalent to parallel vs. all others.)
Network cards with parallel flash would be classified as "local bus"?