linux-kernel - Re: [PATCH 1/2] arm:omap2+: put omap_uart_phys/virt/lsr in .text section when ZIMAGE is true

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Date:   Sat, 10 Jun 2017 11:20:18 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Hoeun Ryu <hoeun.ryu@...il.com>, Tony Lindgren <tony@...mide.com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] arm:omap2+: put omap_uart_phys/virt/lsr in .text
 section when ZIMAGE is true

On Sat, Jun 10, 2017 at 01:44:00PM +0900, Hoeun Ryu wrote:
> Hello, Russell.
> 
> Would you please review this patch ?

It's really up to Tony Lindgren, who is the OMAP maintainer.

> 
> Than you
> 
> > On Jun 8, 2017, at 11:16 AM, Hoeun Ryu <hoeun.ryu@...il.com> wrote:
> > 
> > omap_uart_phys, omap_uart_virt and omap_uart_lsr reside in .data section
> > and it's right implementation. But because of this, we cannot enable
> > CONFIG_DEBUG_UNCOMPRESS. LL_DEBUG and DEBUG_UNCOMPRESS are very useful tools
> > for debugging early boot stage when something goes wrong if you don't have
> > any hardware based debugging tools like a JTAG debugger.
> > This patch is to put the variables into .text section instead only when the
> > DEBUG_LL_INCLUDE file is included in the kernel decompressor, which is only
> > when ZIMAGE is defined.
> > This patch does not change anything when DEBUG_LL_INCLUDE is included in
> > the other kernel parts like arch/arm/kernel/*
> > 
> > Signed-off-by: Hoeun Ryu <hoeun.ryu@...il.com>
> > ---
> > arch/arm/include/debug/omap2plus.S | 11 +++++++++++
> > 1 file changed, 11 insertions(+)
> > 
> > diff --git a/arch/arm/include/debug/omap2plus.S b/arch/arm/include/debug/omap2plus.S
> > index 6d867ae..6ce6ef9 100644
> > --- a/arch/arm/include/debug/omap2plus.S
> > +++ b/arch/arm/include/debug/omap2plus.S
> > @@ -58,11 +58,22 @@
> > 
> > #define UART_OFFSET(addr)    ((addr) & 0x00ffffff)
> > 
> > +/*
> > + * Definition of ZIMAGE is in arch/arm/boot/compressed/Makefile.
> > + * Place the following block in .text section only when this file is
> > + * included by arch/arm/boot/compressed/* to make it possible to
> > + * enable CONFIG_DEBUG_UNCOMPRESS and DEBUG in arch/arm/boot/compressed/head.S
> > + * on OMAP2+ SoCs.
> > + */
> > +#ifndef ZIMAGE
> >        .pushsection .data
> > +#endif
> > omap_uart_phys:    .word    0
> > omap_uart_virt:    .word    0
> > omap_uart_lsr:    .word    0
> > +#ifndef ZIMAGE
> >        .popsection
> > +#endif
> > 
> >        .macro    addruart, rp, rv, tmp
> > 
> > -- 
> > 2.7.4
> > 

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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