linux-kernel - Re: [PATCH] Topcliff PHUB: Generate PacketHub driver

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Message-ID: <000d01cb0db2$7e3f2b80$66f8800a@maildom.okisemi.com>
Date:	Thu, 17 Jun 2010 09:17:35 +0900
From:	"Masayuki Ohtake" <masa-korg@....okisemi.com>
To:	"Arnd Bergmann" <arnd@...db.de>
Cc:	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"Andrew" <andrew.chih.howe.khor@...el.com>,
	"Intel OTC" <joel.clark@...el.com>, "Wang, Qi" <qi.wang@...el.com>,
	"Wang, Yong Y" <yong.y.wang@...el.com>
Subject: Re: [PATCH] Topcliff PHUB: Generate PacketHub driver

Hi Arnd,

Thank you.
I will try it.

Ohtake.

----- Original Message ----- 
From: "Arnd Bergmann" <arnd@...db.de>
To: "Masayuki Ohtake" <masa-korg@....okisemi.com>
Cc: "Alan Cox" <alan@...rguk.ukuu.org.uk>; "LKML" <linux-kernel@...r.kernel.org>; "Andrew"
<andrew.chih.howe.khor@...el.com>; "Intel OTC" <joel.clark@...el.com>; "Wang, Qi" <qi.wang@...el.com>; "Wang, Yong Y"
<yong.y.wang@...el.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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