netdev - Re: [PATCH net 3/4] Revert "sh_eth: Enable Rx descriptor word 0 shift for r8a7790"

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Date:	Thu, 26 Feb 2015 16:14:51 +0000
From:	Ben Hutchings <ben.hutchings@...ethink.co.uk>
To:	netdev@...r.kernel.org
Cc:	linux-kernel@...ts.codethink.co.uk,
	Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@...esas.com>,
	Mitsuhiro Kimura <mitsuhiro.kimura.kc@...esas.com>,
	Yoshihiro Kaneko <ykaneko0929@...il.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Subject: Re: [PATCH net 3/4] Revert "sh_eth: Enable Rx descriptor word 0
 shift for r8a7790"

On Thu, 2015-02-26 at 14:21 +0000, Ben Hutchings wrote:
> This reverts commit fd9af07c3404ac9ecbd0d859563360f51ce1ffde.
> 
> The hardware manual states that the frame error and multicast bits are
> copied to bits 9:0 of RD0, not bits 25:16.  I've tested that this is
> true for RFS1 (CRC error), RFS3 (frame too short), RFS4 (frame too
> long) and RFS8 (multicast).
[...]

This behaviour might of course be dependent on the revision of the chip.
I didn't find a chip ID register in the manual, but I found the recent
patch "ARM: shmobile: Add function to get SoCs revision data for R-Car
Gen2".  With that patch, /proc/cpuinfo on my test system shows:

Hardware        : Generic R8A7790 (Flattened Device Tree)
Revision        : 0020
Serial          : 0000000000000000

Ben.


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