[LinuxBIOS] Checking if FlashROM pin A18 is connected?

Ronald G Minnich rminnich at lanl.gov
Sat Feb 25 22:35:42 CET 2006

Leon Woestenberg wrote:
> Hello,
> I have a 512 kByte FlashROM but use 256 kByte images so far. I 
> concatenate two of them, so even if address pin A18 is dangling, the CPU 
> reads the image correctly.
> Now, if I understand correctly, the util/flashrom utility writes (-w) 
> using the Flash programming algorithms, which do not touch A18. And if I 
> understand correctly, it used
> mmap() to verify the image, which should use A18.
> Am I correct that by following this procedure, I can find out whether 
> A18 is connected on my motherboard to the FlashROM socket? :
> dd if=/dev/random of=/tmp/random.bin bs=1024 count=512
> flashrom -w /tmp/random.bin
> flashrom -v tmp/random.bin
> VERIFIED => A18 is connected

yeah, that ought to work. For this purpose, just for my own sanity, I 
usually make the image a file of ascending 32-bit numbers. Then you can 
use flashrom -r to make sure the things look right, as well as your -v 


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