linux-kernel - Re: [PATCH] net: macb: Add big endian CPU support

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Date:	Wed, 25 Feb 2015 12:50:41 +0100
From:	Michal Simek <monstr@...str.eu>
To:	Arun Chandran <achandran@...sta.com>
CC:	Nicolas Ferre <nicolas.ferre@...el.com>,
	netdev <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] net: macb: Add big endian CPU support

>> endian mode all the time. But the logic for detecting this on CPU is correct and this is what
>> you need to do on Zynq. You are writing big endian value to little endian register and read it back
>> to see if it was correctly written or not.
> 
> Just curious; will the same code work without change on a CPU with Big
> endian IP?
> (ie. If zynq hardware comes with only one change; IP configured in BE;
>  will the driver be needing further changes?)

Depends on HW setup and architecture which you want to use.
Let's say test could be to have Microblaze in PL in BE mode (not supported by tools)
and bridge to axi. Then depends on Linux kernel how IO functions are implemented.
That's why it is hard to say yes/no.

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng), OpenPGP -> KeyID: FE3D1F91
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel - Microblaze cpu - http://www.monstr.eu/fdt/
Maintainer of Linux kernel - Xilinx Zynq ARM architecture
Microblaze U-BOOT custodian and responsible for u-boot arm zynq platform



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