ppc4xx: Add SPL support
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@denx.de>
diff --git a/arch/powerpc/cpu/ppc4xx/start.S b/arch/powerpc/cpu/ppc4xx/start.S
index 52f2623..57ae1d3 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 @@
* 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 @@
.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 @@
#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 @@
/*----------------------------------------------------------------------- */
-#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 @@
lwbrx r3,r0,r3
blr
+#if !defined(CONFIG_SPL_BUILD)
/*
* void relocate_code (addr_sp, gd, addr_moni)
*
@@ -1626,6 +1654,7 @@
mtlr r4 /* restore link register */
blr
+#endif /* CONFIG_SPL_BUILD */
#if defined(CONFIG_440)
/*----------------------------------------------------------------------------+