linux-kernel - Re: [PATCH] mips: sb1250_swarm_defconfig: disable IDE subsystem

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Date:	Mon, 9 Nov 2015 20:33:29 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	linux-mips@...ux-mips.org, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mips: sb1250_swarm_defconfig: disable IDE subsystem

Hello.

On 11/09/2015 07:18 PM, Maciej W. Rozycki wrote:

>>> I can check if things still work correctly when routed through libata,
>>> although it'll have to wait a couple of weeks yet at the least as I have
>>> wired my SWARM for hardware debugging, making it not immediately bootable
>>> and I'll be departing soon (i.e. I have no time for complicated fiddling).
>>> The host driver itself is actually in arch/mips/sibyte/swarm/platform.c
>>> BTW.
>>>
>>>   Note to self: it would be nice if physical rather than virtual MMIO
>>> addresses were reported too.
>>
>> Part of the problem is that everybody who is serious about using a Swarm
>> is using PCI PATA/SATA card, so this part receives very little TLC.  I
>> btw. can't test because the controller on my Pass 2 board is broken ...
>
>   I think I've been reasonably serious about my SWARM and despite issues
> elsewhere the onboard PATA interface is a part of the system I've never
> had any with.  Yes, it's limited to PIO 3, but it's not a big deal, that's
> still 11MB/s (and one of the 4 generic data movers present in the SoC

    If you measure it with something like 'hdparm -t', the real speed figures 
in the PIO modes would disappoint you. It's usually more like 3 MB/s even in 
PIO4...

> could be used as a DMA engine to offload the CPU if anyone bothered
> implementing that in the HBA driver).

    Oh, that's nice!

MBR, Sergei

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