Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH] Topcliff PHUB: Generate PacketHub driver | Date | Wed, 16 Jun 2010 12:50:44 +0200 |
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On Wednesday 16 June 2010, Masayuki Ohtake wrote: > > Especially if you want to be able to use tools like 'cat', 'hexdump' > > or 'dd' on the file descriptor, you need to implement support for > > short reads. > I don't know how to test(short read/write access). > Could you tell me how to do the above ?
The easiest way is using dd, where you can specify the block size as well as input and output offsets.
e.g. dd if=/dev/topcliffphub of=testfile bs=7
Should be able to read the contents of the rom completely without error conditions, copying seven bytes at a time.
dd if=inputfile of=/dev/topcliffphub bs=1 seek=1024 count=16
would write 16 bytes from inputfile into the rom at position 1024.
Arnd
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