[U-Boot] [PATCH 3/8] sbc8548: enable access to second bank of flash

[Paul Gortmaker]

The sbc8548 has a 64MB SODIMM flash module off of CS6 that
previously wasn't enumerated by u-boot.  There were already
BR6/OR6 settings for it [used by cpu_init_f()] but there
was no TLB entry and it wasn't in the list of flash banks
reported to u-boot.

The location of the 64MB flash is "pulled back" 8MB from
a 64MB boundary, in order to allow address space for the
8MB boot flash that is at the end of 32 bit address space.
This means creating two 4MB TLB entries for the 8MB chunk,
and then expanding the original boot flash entry to 64MB
in order to cover the 8MB boot flash and the remainder
(56MB) of the user flash.

Signed-off-by: Paul Gortmaker <paul.gortmaker at windriver.com>
---
 board/sbc8548/tlb.c       |   26 ++++++++++++++++++++++----
 include/configs/sbc8548.h |    7 ++++---
 2 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/board/sbc8548/tlb.c b/board/sbc8548/tlb.c
index 18d11f6..dbb9ba8 100644
--- a/board/sbc8548/tlb.c
+++ b/board/sbc8548/tlb.c
@@ -42,13 +42,14 @@ struct fsl_e_tlb_entry tlb_table[] = {
 		      0, 0, BOOKE_PAGESZ_4K, 0),
 
 	/*
-	 * TLB 0:	16M	Non-cacheable, guarded
-	 * 0xff800000	16M	TLB for 8MB FLASH
+	 * TLB 0:	64M	Non-cacheable, guarded
+	 * 0xfc000000	56M	8MB -> 64MB of user flash
+	 * 0xff800000	8M	boot FLASH
 	 * Out of reset this entry is only 4K.
 	 */
-	SET_TLB_ENTRY(1, CONFIG_SYS_FLASH_BASE, CONFIG_SYS_FLASH_BASE,
+	SET_TLB_ENTRY(1, CONFIG_SYS_ALT_FLASH + 0x800000, CONFIG_SYS_ALT_FLASH + 0x800000,
 		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
-		      0, 0, BOOKE_PAGESZ_16M, 1),
+		      0, 0, BOOKE_PAGESZ_64M, 1),
 
 	/*
 	 * TLB 1:	256M	Non-cacheable, guarded
@@ -103,6 +104,23 @@ struct fsl_e_tlb_entry tlb_table[] = {
 	SET_TLB_ENTRY(1, CONFIG_SYS_EPLD_BASE, CONFIG_SYS_EPLD_BASE,
 		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
 		      0, 6, BOOKE_PAGESZ_16M, 1),
+
+	/*
+	 * TLB 7:	4M	Non-cacheable, guarded
+	 * 0xfb800000	4M	1st 4MB block of 64MB user FLASH
+	 */
+	SET_TLB_ENTRY(1, CONFIG_SYS_ALT_FLASH, CONFIG_SYS_ALT_FLASH,
+		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
+		      0, 7, BOOKE_PAGESZ_4M, 1),
+
+	/*
+	 * TLB 8:	4M	Non-cacheable, guarded
+	 * 0xfbc00000	4M	2nd 4MB block of 64MB user FLASH
+	 */
+	SET_TLB_ENTRY(1, CONFIG_SYS_ALT_FLASH + 0x400000, CONFIG_SYS_ALT_FLASH + 0x400000,
+		      MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
+		      0, 8, BOOKE_PAGESZ_4M, 1),
+
 };
 
 int num_tlb_entries = ARRAY_SIZE(tlb_table);
diff --git a/include/configs/sbc8548.h b/include/configs/sbc8548.h
index 3d05afb..8edba20 100644
--- a/include/configs/sbc8548.h
+++ b/include/configs/sbc8548.h
@@ -163,6 +163,7 @@
  */
 
 #define CONFIG_SYS_BOOT_BLOCK		0xff800000	/* start of 8MB Flash */
+#define CONFIG_SYS_ALT_FLASH		0xfb800000	/* 64MB "user" flash */
 #define CONFIG_SYS_FLASH_BASE		CONFIG_SYS_BOOT_BLOCK	/* start of FLASH 16M */
 
 #define CONFIG_SYS_BR0_PRELIM		0xff800801
@@ -171,9 +172,9 @@
 #define	CONFIG_SYS_OR0_PRELIM		0xff806e65
 #define	CONFIG_SYS_OR6_PRELIM		0xf8006e65
 
-#define CONFIG_SYS_FLASH_BANKS_LIST	{CONFIG_SYS_FLASH_BASE}
-#define CONFIG_SYS_MAX_FLASH_BANKS	1		/* number of banks */
-#define CONFIG_SYS_MAX_FLASH_SECT	128		/* sectors per device */
+#define CONFIG_SYS_FLASH_BANKS_LIST	{CONFIG_SYS_FLASH_BASE, CONFIG_SYS_ALT_FLASH}
+#define CONFIG_SYS_MAX_FLASH_BANKS	2		/* number of banks */
+#define CONFIG_SYS_MAX_FLASH_SECT	256		/* sectors per device */
 #undef	CONFIG_SYS_FLASH_CHECKSUM
 #define CONFIG_SYS_FLASH_ERASE_TOUT	60000	/* Flash Erase Timeout (ms) */
 #define CONFIG_SYS_FLASH_WRITE_TOUT	500	/* Flash Write Timeout (ms) */
-- 
1.6.4.1