[U-Boot] [PATCH 1/3] ppc4xx: Add SPL support
Stefan Roese
sr at denx.de
Fri Feb 22 11:36:49 CET 2013
This patch adds SPL booting support (NOR flash) for the
PPC4xx platforms.
This SPL booting (Falcon mode) will be used by the upcoming
lcd4_lwmon5 board port (lwmon5 variant).
Signed-off-by: Stefan Roese <sr at denx.de>
---
arch/powerpc/cpu/ppc4xx/Makefile | 4 ++
arch/powerpc/cpu/ppc4xx/start.S | 37 +++++++++++++++--
arch/powerpc/cpu/ppc4xx/u-boot-spl.lds | 74 ++++++++++++++++++++++++++++++++++
arch/powerpc/cpu/ppc4xx/u-boot.lds | 2 +
4 files changed, 113 insertions(+), 4 deletions(-)
create mode 100644 arch/powerpc/cpu/ppc4xx/u-boot-spl.lds
diff --git a/arch/powerpc/cpu/ppc4xx/Makefile b/arch/powerpc/cpu/ppc4xx/Makefile
index 8da2f86..e301dc6 100644
--- a/arch/powerpc/cpu/ppc4xx/Makefile
+++ b/arch/powerpc/cpu/ppc4xx/Makefile
@@ -68,6 +68,10 @@ COBJS += miiphy.o
COBJS += uic.o
endif
+ifdef CONFIG_SPL_BUILD
+COBJS-y += spl_boot.o
+endif
+
SRCS := $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(SOBJS) $(COBJS) $(COBJS-y))
START := $(addprefix $(obj),$(START))
diff --git a/arch/powerpc/cpu/ppc4xx/start.S b/arch/powerpc/cpu/ppc4xx/start.S
index 7aef43b..ae990cc 100644
--- a/arch/powerpc/cpu/ppc4xx/start.S
+++ b/arch/powerpc/cpu/ppc4xx/start.S
@@ -232,7 +232,7 @@
*
* Use r12 to access the GOT
*/
-#if !defined(CONFIG_NAND_SPL)
+#if !defined(CONFIG_NAND_SPL) && !defined(CONFIG_SPL_BUILD)
START_GOT
GOT_ENTRY(_GOT2_TABLE_)
GOT_ENTRY(_FIXUP_TABLE_)
@@ -248,7 +248,8 @@
END_GOT
#endif /* CONFIG_NAND_SPL */
-#if defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
+#if defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL) && \
+ !defined(CONFIG_SPL_BUILD)
/*
* NAND U-Boot image is started from offset 0
*/
@@ -270,6 +271,18 @@
bl _start_440
#endif
+#if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
+ /*
+ * This is the entry of the real U-Boot from a board port
+ * that supports SPL booting on the PPC4xx. We only need
+ * to call board_init_f() here. Everything else has already
+ * been done in the SPL u-boot version.
+ */
+ GET_GOT /* initialize GOT access */
+ bl board_init_f /* run 1st part of board init code (in Flash)*/
+ /* NOTREACHED - board_init_f() does not return */
+#endif
+
/*
* 440 Startup -- on reset only the top 4k of the effective
* address space is mapped in by an entry in the instruction
@@ -539,7 +552,7 @@ tlbnx2: addi r4,r4,1 /* Next TLB */
* r3 - 1st arg to board_init(): IMMP pointer
* r4 - 2nd arg to board_init(): boot flag
*/
-#ifndef CONFIG_NAND_SPL
+#if !defined(CONFIG_NAND_SPL) && !defined(CONFIG_SPL_BUILD)
.text
.long 0x27051956 /* U-Boot Magic Number */
.globl version_string
@@ -612,6 +625,18 @@ _end_of_vectors:
.globl _start
_start:
+#if defined(CONFIG_SPL) && !defined(CONFIG_SPL_BUILD)
+ /*
+ * This is the entry of the real U-Boot from a board port
+ * that supports SPL booting on the PPC4xx. We only need
+ * to call board_init_f() here. Everything else has already
+ * been done in the SPL u-boot version.
+ */
+ GET_GOT /* initialize GOT access */
+ bl board_init_f /* run 1st part of board init code (in Flash)*/
+ /* NOTREACHED - board_init_f() does not return */
+#endif
+
/*****************************************************************************/
#if defined(CONFIG_440)
@@ -796,7 +821,9 @@ _start:
#ifdef CONFIG_NAND_SPL
bl nand_boot_common /* will not return */
#else
+#ifndef CONFIG_SPL_BUILD
GET_GOT
+#endif
bl cpu_init_f /* run low-level CPU init code (from Flash) */
bl board_init_f
@@ -1080,7 +1107,7 @@ _start:
/*----------------------------------------------------------------------- */
-#ifndef CONFIG_NAND_SPL
+#if !defined(CONFIG_NAND_SPL) && !defined(CONFIG_SPL_BUILD)
/*
* This code finishes saving the registers to the exception frame
* and jumps to the appropriate handler for the exception.
@@ -1262,6 +1289,7 @@ in32r:
lwbrx r3,r0,r3
blr
+#if !defined(CONFIG_SPL_BUILD)
/*
* void relocate_code (addr_sp, gd, addr_moni)
*
@@ -1626,6 +1654,7 @@ __440_msr_continue:
mtlr r4 /* restore link register */
blr
+#endif /* CONFIG_SPL_BUILD */
#if defined(CONFIG_440)
/*----------------------------------------------------------------------------+
diff --git a/arch/powerpc/cpu/ppc4xx/u-boot-spl.lds b/arch/powerpc/cpu/ppc4xx/u-boot-spl.lds
new file mode 100644
index 0000000..4634263
--- /dev/null
+++ b/arch/powerpc/cpu/ppc4xx/u-boot-spl.lds
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2012-2013 Stefan Roese <sr at denx.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+MEMORY
+{
+ sdram : ORIGIN = CONFIG_SPL_BSS_START_ADDR,
+ LENGTH = CONFIG_SPL_BSS_MAX_SIZE
+ flash : ORIGIN = CONFIG_SPL_TEXT_BASE,
+ LENGTH = CONFIG_SYS_SPL_MAX_LEN
+}
+
+OUTPUT_ARCH(powerpc)
+ENTRY(_start)
+SECTIONS
+{
+#ifdef CONFIG_440
+ .bootpg 0xfffff000 :
+ {
+ arch/powerpc/cpu/ppc4xx/start.o (.bootpg)
+
+ /*
+ * PPC440 board need a board specific object with the
+ * TLB definitions. This needs to get included right after
+ * start.o, since the first shadow TLB only covers 4k
+ * of address space.
+ */
+ CONFIG_BOARDDIR/init.o (.bootpg)
+ } > flash
+#endif
+
+ .resetvec 0xFFFFFFFC :
+ {
+ KEEP(*(.resetvec))
+ } > flash
+
+ .text :
+ {
+ __start = .;
+ arch/powerpc/cpu/ppc4xx/start.o (.text)
+ CONFIG_BOARDDIR/init.o (.text)
+ *(.text*)
+ } > flash
+
+ . = ALIGN(4);
+ .data : { *(SORT_BY_ALIGNMENT(.data*)) } > flash
+
+ . = ALIGN(4);
+ .rodata : { *(SORT_BY_ALIGNMENT(.rodata*)) } > flash
+
+ .bss :
+ {
+ . = ALIGN(4);
+ __bss_start = .;
+ *(.bss*)
+ . = ALIGN(4);
+ __bss_end__ = .;
+ } > sdram
+}
diff --git a/arch/powerpc/cpu/ppc4xx/u-boot.lds b/arch/powerpc/cpu/ppc4xx/u-boot.lds
index a96ddd5..540f7ca 100644
--- a/arch/powerpc/cpu/ppc4xx/u-boot.lds
+++ b/arch/powerpc/cpu/ppc4xx/u-boot.lds
@@ -96,6 +96,7 @@ SECTIONS
. = ALIGN(256);
__init_end = .;
+#ifndef CONFIG_SPL
#ifdef CONFIG_440
.bootpg RESET_VECTOR_ADDRESS - 0xffc :
{
@@ -132,6 +133,7 @@ SECTIONS
#if (RESET_VECTOR_ADDRESS == 0xfffffffc)
. |= 0x10;
#endif
+#endif /* CONFIG_SPL */
__bss_start = .;
.bss (NOLOAD) :
--
1.8.1.4
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