From: Juergen Borleis <jbe@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 1/4] PPC: fix size optimisation
Date: Fri, 27 May 2016 11:32:48 +0200 [thread overview]
Message-ID: <1464341571-22552-2-git-send-email-jbe@pengutronix.de> (raw)
In-Reply-To: <1464341571-22552-1-git-send-email-jbe@pengutronix.de>
Since patch e92abad36307d the linker discards sections which seems not
used to make the image smaller.
But this change will discard the whole init and exception code from start.S
which renders the final image useless.
From 'barebox.map' without this patch:
Discarded input sections
.text 0x0000000000000000 0x358c arch/ppc/mach-mpc5xxx/start.o
.data 0x0000000000000000 0x0 arch/ppc/mach-mpc5xxx/start.o
.bss 0x0000000000000000 0x0 arch/ppc/mach-mpc5xxx/start.o
.got2 0x0000000000000000 0x24 arch/ppc/mach-mpc5xxx/start.o
[...]
So, define the entry point to mark the init and exception used.
From 'barebox.map' with this patch applied:
Discarded input sections
.data 0x0000000000000000 0x0 arch/ppc/mach-mpc5xxx/start.o
.bss 0x0000000000000000 0x0 arch/ppc/mach-mpc5xxx/start.o
[...]
Note: tested on MPC5200 at run time, for MPC85XX compile time only
Signed-off-by: Juergen Borleis <jbe@pengutronix.de>
---
arch/ppc/boards/pcm030/barebox.lds.S | 1 +
arch/ppc/mach-mpc85xx/barebox.lds.S | 1 +
2 files changed, 2 insertions(+)
diff --git a/arch/ppc/boards/pcm030/barebox.lds.S b/arch/ppc/boards/pcm030/barebox.lds.S
index 0e08e05..0e34f0a 100644
--- a/arch/ppc/boards/pcm030/barebox.lds.S
+++ b/arch/ppc/boards/pcm030/barebox.lds.S
@@ -20,6 +20,7 @@
#include <asm-generic/barebox.lds.h>
OUTPUT_ARCH("powerpc")
+ENTRY(_start)
/* Do we need any of these for elf?
__DYNAMIC = 0; */
SECTIONS
diff --git a/arch/ppc/mach-mpc85xx/barebox.lds.S b/arch/ppc/mach-mpc85xx/barebox.lds.S
index 1f7f52c..beebab3 100644
--- a/arch/ppc/mach-mpc85xx/barebox.lds.S
+++ b/arch/ppc/mach-mpc85xx/barebox.lds.S
@@ -22,6 +22,7 @@
#endif
OUTPUT_ARCH("powerpc")
+ENTRY(_start_e500)
PHDRS
{
--
2.8.1
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next prev parent reply other threads:[~2016-05-27 9:33 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-27 9:32 Some fixes for MPC5200 platforms Juergen Borleis
2016-05-27 9:32 ` Juergen Borleis [this message]
2016-05-27 9:32 ` [PATCH 2/4] PPC: clean compiler warning Juergen Borleis
2016-05-27 9:32 ` [PATCH 3/4] PPC/MPC5XXX/reginfo: fix a bunch of compiler warnings Juergen Borleis
2016-05-27 9:32 ` [PATCH 4/4] PPC/MPC5200: enable a useful command by default Juergen Borleis
2016-05-30 5:08 ` Some fixes for MPC5200 platforms Sascha Hauer
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