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

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

[Hoeun Ryu]

 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@gmail.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

[PATCH 2/2] arm:omap2+: drop dependence on DEBUG_OMAP2PLUS_UART for DEBUG_UNCOMPRESS

[Hoeun Ryu]

 With a patch 9a5151e1d1ba4df41bc4b8e8c0f17163247645ac, "arm:omap2+: put
omap_uart_phys/virt/lsr in .text section when ZIMAGE is true", the
dependence on DEBUG_OMAP2PLUS_UART for DEBUG_UNCOMPRESS can be dropped,
because all code of omap2+'s DEBUG_LL_INCLUDE file is in .text section when
it's included in the decompressor.

Signed-off-by: Hoeun Ryu <hoeun.ryu@gmail.com>
---
 arch/arm/Kconfig.debug | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index ba2cb63..52eb0bf 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -1735,8 +1735,7 @@ config DEBUG_UART_8250_FLOW_CONTROL
 config DEBUG_UNCOMPRESS
 	bool
 	depends on ARCH_MULTIPLATFORM || PLAT_SAMSUNG || ARM_SINGLE_ARMV7M
-	default y if DEBUG_LL && !DEBUG_OMAP2PLUS_UART && \
-		     (!DEBUG_TEGRA_UART || !ZBOOT_ROM) && \
+	default y if DEBUG_LL && (!DEBUG_TEGRA_UART || !ZBOOT_ROM) && \
 		     !DEBUG_BRCMSTB_UART
 	help
 	  This option influences the normal decompressor output for
-- 
2.7.4

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

[Hoeun Ryu]

Hello, Russell.

Would you please review this patch ?

Than you

> On Jun 8, 2017, at 11:16 AM, Hoeun Ryu <hoeun.ryu@gmail.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@gmail.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
> 

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

[Russell King - ARM Linux]

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@gmail.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@gmail.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
> > 

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

[Tony Lindgren]

* Russell King - ARM Linux <linux@armlinux.org.uk> [170610 03:24]:
> 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.

I'll take a look today. I think we can simplify things quite
a bit as we no longer use machine type for configuring the
UART.

Regards,

Tony