[PATCH 05/10] powerpc: mpc8xx: Reorganise init RAM

[Christophe Leroy]

Using SMC relocation microcode patch or USB-SOF microcode patch
will disable DPRAM memory from 0x2000 to 0x2400 and from 0x2f00
to 0x3000.

At the time being, init RAM is setup to use 0x2800-0x2e00, but
the stack pointer goes beyond 0x2800 and even beyond 0x2400.

For the time being we are not going to use any microcode patch
that uses memory about 0x3000, so reorganise setup to use:
- 0x2800 - 0x2e00 for init malloc and global data and CPM buffers
- 0x3000 - 0x3c00 for init stack

For more details about CPM dual port ram, see
commit b1d62424cb ("powerpc: mpc8xx: redistribute data in CPM dpram")

Signed-off-by: Christophe Leroy <christophe.leroy at csgroup.eu>
---
 arch/powerpc/cpu/mpc8xx/start.S    |  9 +++++----
 arch/powerpc/include/asm/cpm_8xx.h | 16 ++++++++--------
 include/configs/cmpc885.h          |  1 +
 include/configs/mcr3000.h          |  1 +
 4 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/arch/powerpc/cpu/mpc8xx/start.S b/arch/powerpc/cpu/mpc8xx/start.S
index 0aa73fca12..41f12021c8 100644
--- a/arch/powerpc/cpu/mpc8xx/start.S
+++ b/arch/powerpc/cpu/mpc8xx/start.S
@@ -141,14 +141,15 @@ in_flash:
 	mtspr	DER, r2
 
 	/* set up the stack on top of internal DPRAM */
+	lis	r1, CFG_SYS_INIT_SP at h
+	ori	r1, r1, CFG_SYS_INIT_SP at l
+	stwu	r0, -4(r1)
+	stwu	r0, -4(r1)
+
 	lis	r3, (CFG_SYS_INIT_RAM_ADDR + CFG_SYS_INIT_RAM_SIZE)@h
 	ori	r3, r3, (CFG_SYS_INIT_RAM_ADDR + CFG_SYS_INIT_RAM_SIZE)@l
-	stw	r0, -4(r3)
-	stw	r0, -8(r3)
-	addi	r1, r3, -8
 
 	bl	board_init_f_alloc_reserve
-	addi	r1, r3, -8
 
 	/* Zeroise the CPM dpram */
 	lis	r4, CONFIG_SYS_IMMR at h
diff --git a/arch/powerpc/include/asm/cpm_8xx.h b/arch/powerpc/include/asm/cpm_8xx.h
index 09c24efd91..77ffcce5a6 100644
--- a/arch/powerpc/include/asm/cpm_8xx.h
+++ b/arch/powerpc/include/asm/cpm_8xx.h
@@ -51,14 +51,14 @@
 /*
  * DPRAM defines and allocation functions
  */
-#define CPM_SERIAL_BASE		0x1800
-#define CPM_I2C_BASE		0x1820
-#define CPM_SPI_BASE		0x1840
-#define CPM_FEC_BASE		0x1860
-#define CPM_SERIAL2_BASE	0x18e0
-#define CPM_SCC_BASE		0x1900
-#define CPM_POST_BASE		0x1980
-#define CPM_WLKBD_BASE		0x1a00
+#define CPM_SERIAL_BASE		0x0800
+#define CPM_I2C_BASE		0x0820
+#define CPM_SPI_BASE		0x0840
+#define CPM_FEC_BASE		0x0860
+#define CPM_SERIAL2_BASE	0x08E0
+#define CPM_SCC_BASE		0x0900
+#define CPM_POST_BASE		0x0980
+#define CPM_WLKBD_BASE		0x0a00
 
 #define BD_IIC_START	((uint) 0x0400) /* <- please use CPM_I2C_BASE !! */
 
diff --git a/include/configs/cmpc885.h b/include/configs/cmpc885.h
index b76230e9a4..545365e112 100644
--- a/include/configs/cmpc885.h
+++ b/include/configs/cmpc885.h
@@ -9,6 +9,7 @@
 /* Definitions for initial stack pointer and data area (in DPRAM) */
 #define CFG_SYS_INIT_RAM_ADDR		(CONFIG_SYS_IMMR + 0x2800)
 #define CFG_SYS_INIT_RAM_SIZE		(0x2e00 - 0x2800)
+#define CFG_SYS_INIT_SP			(CONFIG_SYS_IMMR + 0x3c00)
 
 /* RAM configuration (note that CFG_SYS_SDRAM_BASE must be zero) */
 #define CFG_SYS_SDRAM_BASE		0x00000000
diff --git a/include/configs/mcr3000.h b/include/configs/mcr3000.h
index 6b16b050ff..a07761fdbb 100644
--- a/include/configs/mcr3000.h
+++ b/include/configs/mcr3000.h
@@ -14,6 +14,7 @@
 /* Definitions for initial stack pointer and data area (in DPRAM) */
 #define CFG_SYS_INIT_RAM_ADDR	(CONFIG_SYS_IMMR + 0x2800)
 #define	CFG_SYS_INIT_RAM_SIZE	(0x2e00 - 0x2800)
+#define CFG_SYS_INIT_SP		(CONFIG_SYS_IMMR + 0x3c00)
 
 /* RAM configuration (note that CFG_SYS_SDRAM_BASE must be zero) */
 #define	CFG_SYS_SDRAM_BASE		0x00000000
-- 
2.39.2