Hi Rudolf, On Mon, 2010-07-12 at 21:52 +0200, Rudolf Marek wrote: > > What happens if you try to selectively write or erase only the bottom 4 > > KB of each chip? > > Well I tried to write there 512KB of zeros using -c A25L40PT with PT chip > then erase with -E -c A25L40PT > > This works fine. Same with PU chip with -c A25L40PU. However if there is some > combination of non-agreeing chips/params I got hard lockup of whole computer.
Okay, so write/erase works fine with the setting that matches the chip in hand? > > > With PU chip, written all 0's with right switch and then erasing PT param: > > ruiktest:~/flashrom# ./flashrom -VE -c A25L40PT > Erasing flash chip... Looking at blockwise erase function 0... trying... > 0x000000-0x00ffff, ERASE FAILED at 0x00001000! Expected=0xff, Read=0x00, > failed > byte count from 0x00000000-0x0000ffff: 0xf000 > ERASE FAILED! > > Looking at blockwise erase function 1... trying... 0x000000-0x07ffff, > This is really useful to know! The blockwise erase function fails at the 4 K (0x1000) mark. The flashrom program expects to erase a 64 K segment (0x10000) because it thinks it is talking to a PT chip, but it only gets 4 K erased, because the chip is really a PU. That makes sense! What about the reverse case? What if you put in the PT chip and tell flashrom that it's a PU? flashrom -VE -c A25L40PU In this case, it should fail when it tries to erase the /upper/ region of the memory, because flashrom is expecting to erase a 64 K chunk, but only getting 4 K since it is really a top boot block chip. If that's really what happens... then I am convinced once and for all that the PT and PU really are distinct chips! > <hang> > > It hangs pretty solid, keyboard non-responsive. I don't understand why it hangs... I guess this is an issue with your chipset? Dan _______________________________________________ flashrom mailing list [email protected] http://www.flashrom.org/mailman/listinfo/flashrom
