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Re: problem bring up initramfs and busybox

To: myuboot@fastmail.fm
Subject: Re: problem bring up initramfs and busybox
From: Florian Fainelli <florian@openwrt.org>
Date: Thu, 26 Nov 2009 09:45:58 +0100
Cc: "David VomLehn" <dvomlehn@cisco.com>, "Chris Dearman" <chris@mips.com>, "linux-mips" <linux-mips@linux-mips.org>
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Reply-to: Florian Fainelli <florian@openwrt.org>
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Hi Andrew.

Le jeudi 26 novembre 2009 01:24:13, myuboot@fastmail.fm a écrit :
> On Tue, 17 Nov 2009 20:03 -0500, "David VomLehn" <dvomlehn@cisco.com>
> 
> wrote:
> > On Tue, Nov 17, 2009 at 06:58:35PM -0600, myuboot@fastmail.fm wrote:
> > > On Wed, 18 Nov 2009 01:39 +0100, "Florian Fainelli"
> > >
> > > <florian@openwrt.org> wrote:
> > > > -------------------------------
> > >
> > > Actually I already got this patch for the board in little endian mode,
> > > and it is still there for the big endian mode. And this is one of the
> > > place I have been wondering if that needs to be changed for big endian.
> >
> > It sounds like you've done a good job getting the bootloader and kernel
> > to work, so this may be a silly suggestion, but are you sure your root
> > filesystem and busybox are little-endian? It would be an easy mistake to
> > make...
> >
> > > thanks. Andrew
> >
> > David VL
> 
> I have some clue on this issue now. It seems there is some problem with
> the serial console operating in interrupt mode. If the 8250 is in
> polling mode(set the IRQ for the 8250 serial port to 0), the output on
> the console is fine. But with 8250 in interrupt mode, 8250 serial driver
> does not receive any interrupt in serial8250_interrupt(). The same board
> works just fine when operating in little endian mode with interruption.
> I probably need to change something in IRQ initialization for big
> endian. I will post my solution when I can get it to work. In the
> meantime, any suggestion will be welcome.

Do you need that patch to work in little-endian: 
https://dev.openwrt.org/browser/trunk/target/linux/ar7/patches-2.6.30/500-
serial_kludge.patch ? If so, you are likely to need it in big-endian too since 
it works around a silicon issue.
-- 
Best regards, Florian Fainelli
Email: florian@openwrt.org
Web: http://openwrt.org
IRC: [florian] on irc.freenode.net
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