linux-kernel - RE: [PATCH v4 5/5] zynq: move static peripheral mappings

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Date:	Sat, 27 Oct 2012 16:52:38 +0000
From:	Michal Simek <michal.simek@...inx.com>
To:	Josh Cartwright <josh.cartwright@...com>,
	Nick Bowler <nbowler@...iptictech.com>
CC:	"arm@...nel.org" <arm@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	John Linn <linnj@...inx.com>
Subject: RE: [PATCH v4 5/5] zynq: move static peripheral mappings

HI Josh and Nick,

look below.

> -----Original Message-----
> From: Josh Cartwright [mailto:josh.cartwright@...com]
> Sent: Friday, October 26, 2012 3:03 AM
> To: Nick Bowler
> Cc: arm@...nel.org; Arnd Bergmann; linux-kernel@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org; John Linn; Michal Simek
> Subject: Re: [PATCH v4 5/5] zynq: move static peripheral mappings
> 
> On Thu, Oct 25, 2012 at 06:41:08PM -0400, Nick Bowler wrote:
> > On 2012-10-25 16:29 -0500, Josh Cartwright wrote:
> > > On Thu, Oct 25, 2012 at 04:17:01PM -0400, Nick Bowler wrote:
> > > > Did you test this on any real hardware?  I can't get the ZC702 to
> > > > work with the UART mapped at this address (this ends up being
> > > > mapped at 0xFEFFF000), although I can't for the life of me figure
> > > > out why the virtual address even matters.  Note that for the
> > > > ZC702, the physical address of the "main" UART is 0xE0001000.
> 
> Good news is you're not crazy; I was able to duplicate the problem here.
> 
> > If I were to guess, I would guess that, except for when it "Works",
> > the really really early printk stuff isn't actually hitting the uart
> > at all.  The "Fails" case would then be due to the stray writes
> > crashing the board, and the "Truncated" case due to the stray writes
> > being (ostensibly) benign.
> 
> If I'm not mistaken, this hypothesis is predicated on the early bootup code
> establishing a (linear?) mapping for addresses > VMALLOC_START; before the
> mdesc->map_io() is even handled.  That seems odd to me.
> 
> > But I really have no way right now to test this hypothesis, since I
> > can't print anything in the failing case.
> 
> Not sure if I'll be able to get anything meaningful out of it yet (I've not
> historically had good luck with Xilinx's debugging tools), but I did finally get a
> JTAG debugger hooked up to the zc702.  I'll see if I can get any useful
> information tomorrow.

I have seen the same problem on zc702. I will debug it.
Josh: the best will be if you can send v5 for patches 1-3 (1 with small changes in dts - uart)  which I will apply
to arm-next. 

4/5 should go out of zynq subtree, it means directly to arm-soc or via Russel's tree. 

5/5 + Nick patch should be tested. 

Thanks,
Michal


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