[U-Boot] [PATCH 06/11] arm: cm4008, cm41xx: Fix ROM relocation

[Yann Vernier]

Changed CONFIG_SYS_TEXT_BASE to actual address (required for
board_init_f) and moved it into cm4{008,1xx}.h, along with a warning
that it must match CONFIG_SYS_FLASH_BASE (since lowlevel_init
relocates there).
lowlevel_init now uses CONFIG_SYS_RCS0_BASE to map ROM.
---
Changes for v2:
   - Update to use CONFIG_SYS_FLASH_ constants only (no PHYS_FLASH)
   - Use tabs where appropriate
   - Update cm41xx also
   - Explain the lowlevel_init change
Changes for v3:
   - Use memory mappings per defined macros
   - Change the final adjustment of lr and ip
   - Verified mapping flash at 0x3000000 on KS8695X demo board
---
 arch/arm/cpu/arm920t/ks8695/lowlevel_init.S |   63 +++++++++++++++++++--------
 board/cm4008/config.mk                      |    1 -
 board/cm41xx/config.mk                      |    1 -
 3 files changed, 45 insertions(+), 20 deletions(-)

diff --git a/arch/arm/cpu/arm920t/ks8695/lowlevel_init.S b/arch/arm/cpu/arm920t/ks8695/lowlevel_init.S
index 1bba571..74579ed 100644
--- a/arch/arm/cpu/arm920t/ks8695/lowlevel_init.S
+++ b/arch/arm/cpu/arm920t/ks8695/lowlevel_init.S
@@ -25,6 +25,7 @@
 #include <config.h>
 #include <version.h>
 #include <asm/arch/platform.h>
+#include <asm/arch/regvalues.h>
 
 #ifndef CONFIG_SKIP_LOWLEVEL_INIT
 
@@ -91,12 +92,31 @@ lowlevel_init:
 	 * remap the memory and flash regions. we want to end up with
 	 * ram from address 0, and flash at 32MB.
 	 */
+#if CONFIG_SYS_RCS0_BASE!=CONFIG_SYS_TEXT_BASE
+#error CONFIG_SYS_RCS0_BASE and CONFIG_SYS_TEXT_BASE must match for highflash address to work
+	/* Also needed for pointers in board_init_f() */
+#endif
+#if CONFIG_SYS_RCS0_BASE>=KS8695_IO_BASE
+#error Cannot relocate ROM past IO registers
+	/* Firstly, the IO registers are at the top supported address.
+	   Secondly, as we grow the ROM region it must not overlap the registers. */
+#endif
+#if CONFIG_SYS_RCS0_BASE&0xffff
+#error Cannot map memory to addresses not divisible by 64K
+#endif
 	ldr	r1, =(KS8695_IO_BASE+KS8695_MEM_CTRL0)
-	ldr	r2, =0xbfc00040
+	/* The default ROM mapping is at 0x0 - 0x01ffffff.
+	   Remap it to 0x0 - 0x03feffff so that it covers 0x02000000,
+	   where CONFIG_SYS_FLASH_BASE maps it, as well as 0.
+	   Relies on the limited address lines to repeat ROM images
+	   on every multiple of the real ROM size. */
+	ldr	r2, =(KS8695_MEM_RANGE(0,0x03ff0000)|(CONFIG_KS8695_ROMCON0_VALUE&0xfff))
 	str	r2, [r1]		/* large flash map */
-	ldr	pc, =(highflash+0x02000000-0x00f00000)	/* jump to high flash address */
+	/* Relies on CONFIG_SYS_RCS0_BASE==CONFIG_SYS_TEXT_BASE */
+	ldr	pc, =(highflash)	/* jump to high flash address */
 highflash:
-	ldr	r2, =0x8fe00040
+	/* Move ROM to high address, and reconfigure to 4MiB size */
+	ldr	r2, =CONFIG_KS8695_ROMCON0_VALUE
 	str	r2, [r1]		/* remap flash range */
 
 	/*
@@ -105,28 +125,35 @@ highflash:
 	 * then you can have it all mapped nicely. Has no effect if you
 	 * only have a 4Mb or smaller flash.
 	 */
+#if CONFIG_SYS_RCS1_WIDTH
 	ldr	r1, =(KS8695_IO_BASE+KS8695_MEM_CTRL1)
-	ldr	r2, =0x9fe40040
+	ldr	r2, =CONFIG_KS8695_ROMCON1_VALUE
 	str	r2, [r1]		/* remap flash2 region, contiguous */
-	ldr	r1, =(KS8695_IO_BASE+KS8695_MEM_GENERAL)
-	ldr	r2, =0x30000005
-	str	r2, [r1]		/* enable both flash selects */
+#endif
 
-#ifdef CONFIG_CM41xx
 	/*
-	 * map the second flash chip, using the external IO lines.
+	 * map additional flash chip, using the external IO lines.
 	 */
+#if CONFIG_SYS_ECS0_WIDTH
 	ldr	r1, =(KS8695_IO_BASE+KS8695_IO_CTRL0)
-	ldr	r2, =0xafe80b6d
-	str	r2, [r1]		/* remap io0 region, contiguous */
+	ldr	r2, =CONFIG_KS8695_EXTACON0_VALUE
+	str	r2, [r1]		/* map io0 region */
+#endif
+#if CONFIG_SYS_ECS1_WIDTH
 	ldr	r1, =(KS8695_IO_BASE+KS8695_IO_CTRL1)
-	ldr	r2, =0xbfec0b6d
-	str	r2, [r1]		/* remap io1 region, contiguous */
-	ldr	r1, =(KS8695_IO_BASE+KS8695_MEM_GENERAL)
-	ldr	r2, =0x30050005
-	str	r2, [r1]		/* enable second flash */
+	ldr	r2, =CONFIG_KS8695_EXTACON1_VALUE
+	str	r2, [r1]		/* map io1 region */
+#endif
+#if CONFIG_SYS_ECS2_WIDTH
+	ldr	r1, =(KS8695_IO_BASE+KS8695_IO_CTRL2)
+	ldr	r2, =CONFIG_KS8695_EXTACON2_VALUE
+	str	r2, [r1]		/* map io2 region */
 #endif
 
+	ldr	r1, =(KS8695_IO_BASE+KS8695_MEM_GENERAL)
+	ldr	r2, =CONFIG_KS8695_ERGCON_VALUE
+	str	r2, [r1]		/* enable relevant flash selects */
+
 	/*
 	 * before relocating, we have to setup RAM timing
 	 */
@@ -198,8 +225,8 @@ highflash:
 nobutton:
 #endif
 
-	add	lr, lr, #0x02000000	/* flash is now mapped high */
-	add	ip, ip, #0x02000000	/* this is a hack */
+	add	lr, lr, #CONFIG_SYS_TEXT_BASE	/* flash is now mapped high */
+	add	ip, ip, #CONFIG_SYS_TEXT_BASE	/* this is a hack */
 	mov	pc, lr			/* all done, return */
 
 #endif /* CONFIG_SKIP_LOWLEVEL_INIT */
diff --git a/board/cm4008/config.mk b/board/cm4008/config.mk
deleted file mode 100644
index 0d5923b..0000000
--- a/board/cm4008/config.mk
+++ /dev/null
@@ -1 +0,0 @@
-CONFIG_SYS_TEXT_BASE = 0x00f00000
diff --git a/board/cm41xx/config.mk b/board/cm41xx/config.mk
deleted file mode 100644
index 0d5923b..0000000
--- a/board/cm41xx/config.mk
+++ /dev/null
@@ -1 +0,0 @@
-CONFIG_SYS_TEXT_BASE = 0x00f00000
-- 
1.7.10.4