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Re: problem bring up initramfs and busybox

To: "Florian Fainelli" <florian@openwrt.org>
Subject: Re: problem bring up initramfs and busybox
From: myuboot@fastmail.fm
Date: Thu, 26 Nov 2009 12:23:16 -0600
Cc: "David VomLehn" <dvomlehn@cisco.com>, "Chris Dearman" <chris@mips.com>, "linux-mips" <linux-mips@linux-mips.org>
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On Thu, 26 Nov 2009 09:45 +0100, "Florian Fainelli"
<florian@openwrt.org> wrote:
> 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
> -------------------------------
I did not need the patch for little endian. For the UART type, I used
PORT_16550 instead of AR7 and it worked just fine. Thanks for the
suggestion though.
Best regards, Andrew

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