Messages in this thread | | | From | "Masayuki Ohtake" <> | Subject | Re: [PATCH] Topcliff PHUB: Generate PacketHub driver | Date | Thu, 17 Jun 2010 09:17:35 +0900 |
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Hi Arnd,
Thank you. I will try it.
Ohtake.
----- Original Message ----- From: "Arnd Bergmann" <arnd@arndb.de> To: "Masayuki Ohtake" <masa-korg@dsn.okisemi.com> Cc: "Alan Cox" <alan@lxorguk.ukuu.org.uk>; "LKML" <linux-kernel@vger.kernel.org>; "Andrew" <andrew.chih.howe.khor@intel.com>; "Intel OTC" <joel.clark@intel.com>; "Wang, Qi" <qi.wang@intel.com>; "Wang, Yong Y" <yong.y.wang@intel.com> Sent: Wednesday, June 16, 2010 7:50 PM Subject: Re: [PATCH] Topcliff PHUB: Generate PacketHub driver
> 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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