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Re: Broadcom Swarm support

To: Aurelien Jarno <aurelien@aurel32.net>
Subject: Re: Broadcom Swarm support
From: Ralf Baechle <ralf@linux-mips.org>
Date: Sat, 27 Jun 2009 10:14:43 +0100
Cc: Kaz Kylheku <KKylheku@zeugmasystems.com>, linux-mips@linux-mips.org
In-reply-to: <20090627051026.GB18476@hall.aurel32.net>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20090624063453.GA16846@volta.aurel32.net> <DDFD17CC94A9BD49A82147DDF7D545C501C3539B@exchange.ZeugmaSystems.local> <20090626232432.GB3235@linux-mips.org> <20090627051026.GB18476@hall.aurel32.net>
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On Sat, Jun 27, 2009 at 07:10:26AM +0200, Aurelien Jarno wrote:

> Yes, booting on the IDE controller.

Chances are it's a bug in the PIO IDE driver or it's interaction with
update_mmu_cache().  If I'm right you should not see the issue if you
boot of another block device with DMA like a PCI PATA/SATA card.

Which generally is a sane thing to do - the onboard controller is a
quick hack to demonstrate the capabilities of the BCM1250's GPIO features;
in practical terms it totally sucks but I SATA card solves that.  If
you do that, get a 64-bit card.  32-bit DMA PCI cards have other issues
in Sibyte systems.

  Ralf

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