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Re: [PATCH V2 2/4] MIPS: Add board support for Loongson1B

To: Kelvin Cheung <keguang.zhang@gmail.com>
Subject: Re: [PATCH V2 2/4] MIPS: Add board support for Loongson1B
From: Giuseppe CAVALLARO <peppe.cavallaro@st.com>
Date: Mon, 24 Oct 2011 14:18:58 +0200
Cc: Wu Zhangjin <wuzhangjin@gmail.com>, linux-mips@linux-mips.org, linux-kernel@vger.kernel.org, ralf@linux-mips.org, r0bertz@gentoo.org, netdev@vger.kernel.org
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Hello Kelvin.

On 10/24/2011 12:36 PM, Kelvin Cheung wrote:

[snip]

> According to datasheet of Loongson 1B, the buffer size in RX/TX 
> descriptor is only 2KB. So the Loongson1B's GMAC could not handle
> jumbo frames. And the second buffer is useless in this case. Am I
> right? Is there a better way than ifdef CONFIG_MACH_LOONGSON1 to
> avoid duplicate code?

Sorry for my misunderstanding.

I think you have to use the normal descriptor and remove the enh_desc
from the platform w/o modifying the driver at all.

The driver will be able to select/configure all automatically (also jumbo).

Let me know.

Note:
IIRC, there is a bit difference in case of normal descriptors for
Synopsys databook newer than the 1.91 (I used for testing this mode).
In any case, I remember that, on some platforms, the normal descriptors
have been used w/o problems also on these new chip generations.

Peppe


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