[U-Boot] [PATCH] [ONENAND] Reduce OneNAND IPL code size v2

[Kyungmin Park]

OneNAND IPL has common codes for RAM init, load data, and jump to 2nd
bootloader, but it's common code used about 300~400 bytes. So board
specific codes, such as lowlevel_init, can't has enough code. It make
a difficult to implement OneNAND IPL.

This patch make this common code as small as possible. and give
lowlevel_init can have more codes.

Signed-off-by: Kyungmin Park <kyungmin.park at samsung.com>
---
diff --git a/cpu/arm1136/start.S b/cpu/arm1136/start.S
index e622338..132cc4a 100644
--- a/cpu/arm1136/start.S
+++ b/cpu/arm1136/start.S
@@ -33,23 +33,7 @@
 .globl _start
 _start: b	reset
 #ifdef CONFIG_ONENAND_IPL
-	ldr	pc, _hang
-	ldr	pc, _hang
-	ldr	pc, _hang
-	ldr	pc, _hang
-	ldr	pc, _hang
-	ldr	pc, _hang
-	ldr	pc, _hang
-
-_hang:
-	.word	do_hang
-	.word	0x12345678
-	.word	0x12345678
-	.word	0x12345678
-	.word	0x12345678
-	.word	0x12345678
-	.word	0x12345678
-	.word	0x12345678	/* now 16*4=64 */
+	. = _start + 64		/* now 16*4=64 */
 #else
 	ldr	pc, _undefined_instruction
 	ldr	pc, _software_interrupt
@@ -362,12 +346,7 @@ cpu_init_crit:
 /*
  * exception handlers
  */
-#ifdef CONFIG_ONENAND_IPL
-	.align	5
-do_hang:
-	ldr	sp, _TEXT_BASE			/* use 32 words about stack */
-	bl	hang				/* hang and never return */
-#else	/* !CONFIG_ONENAND IPL */
+#ifndef CONFIG_ONENAND_IPL
 	.align	5
 undefined_instruction:
 	get_bad_stack
diff --git a/onenand_ipl/onenand_boot.c b/onenand_ipl/onenand_boot.c
index aff62d2..2440d8b 100644
--- a/onenand_ipl/onenand_boot.c
+++ b/onenand_ipl/onenand_boot.c
@@ -39,6 +39,7 @@ int print_info(void)
 
 typedef int (init_fnc_t)(void);
 
+#ifdef CONFIG_USE_ONENAND_INIT
 init_fnc_t *init_sequence[] = {
 	board_init,		/* basic board dependent setup */
 #ifdef CONFIG_SYS_PRINTF
@@ -47,24 +48,23 @@ init_fnc_t *init_sequence[] = {
 #endif
 	NULL,
 };
+#endif
 
 void start_oneboot(void)
 {
-	init_fnc_t **init_fnc_ptr;
 	uchar *buf;
+#ifdef CONFIG_USE_ONENAND_INIT
+	init_fnc_t **init_fnc_ptr;
 
 	for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
 		if ((*init_fnc_ptr)() != 0)
 			hang();
 	}
+#endif
 
 	buf = (uchar *) CONFIG_SYS_LOAD_ADDR;
 
-	if (!onenand_read_block0(buf))
-		buf += ONENAND_BLOCK_SIZE;
-
-	if (buf == (uchar *)CONFIG_SYS_LOAD_ADDR)
-		hang();
+	onenand_read_block0(buf);
 
 	/* go run U-Boot and never return */
 	printf("Starting OS Bootloader...\n");
@@ -73,9 +73,11 @@ void start_oneboot(void)
 	/* should never come here */
 }
 
+#ifdef CONFIG_USE_ONENAND_INIT
 void hang(void)
 {
 	/* if board_hang() returns, hange here */
 	printf("X-Loader hangs\n");
 	for (;;);
 }
+#endif
diff --git a/onenand_ipl/onenand_ipl.h b/onenand_ipl/onenand_ipl.h
index 3387998..438e58c 100644
--- a/onenand_ipl/onenand_ipl.h
+++ b/onenand_ipl/onenand_ipl.h
@@ -23,7 +23,7 @@
 
 #include <linux/mtd/onenand_regs.h>
 
-#define ONENAND_BLOCK_SIZE              2048
+#define ONENAND_BLOCK_SIZE              0x20000
 
 #ifndef CONFIG_SYS_PRINTF
 #define printf(format, args...)
@@ -39,5 +39,5 @@
 
 #define ONENAND_PAGE_SIZE                       2048
 
-extern int onenand_read_block0(unsigned char *buf);
+extern void onenand_read_block0(unsigned char *buf);
 #endif
diff --git a/onenand_ipl/onenand_read.c b/onenand_ipl/onenand_read.c
index 6d04943..38703fb 100644
--- a/onenand_ipl/onenand_read.c
+++ b/onenand_ipl/onenand_read.c
@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2005-2008 Samsung Electronis
+ * (C) Copyright 2005-2008 Samsung Electronics
  * Kyungmin Park <kyungmin.park at samsung.com>
  *
  * See file CREDITS for list of people who contributed to this
@@ -87,14 +87,16 @@ static inline int onenand_read_page(ulong block, ulong page,
 
 #define ONENAND_START_PAGE		1
 #define ONENAND_PAGES_PER_BLOCK		64
+#ifndef CONFIG_ONENAND_END_BLOCK
+#define CONFIG_ONENAND_END_BLOCK	1
+#endif
 
 /**
  * onenand_read_block - Read a block data to buf
- * @return 0 on success
  */
-int onenand_read_block0(unsigned char *buf)
+void onenand_read_block0(unsigned char *buf)
 {
-	int page, offset = 0;
+	int block, page, offset = 0;
 	int pagesize = ONENAND_PAGE_SIZE;
 
 	/* MLC OneNAND has 4KiB page size */
@@ -103,12 +105,12 @@ int onenand_read_block0(unsigned char *buf)
 
 	/* NOTE: you must read page from page 1 of block 0 */
 	/* read the block page by page*/
-	for (page = ONENAND_START_PAGE;
-	    page < ONENAND_PAGES_PER_BLOCK; page++) {
-
-		onenand_read_page(0, page, buf + offset, pagesize);
-		offset += pagesize;
+	page = ONENAND_START_PAGE;
+	for (block = 0; block < CONFIG_ONENAND_END_BLOCK; block++) {
+		for (; page < ONENAND_PAGES_PER_BLOCK; page++) {
+			onenand_read_page(block, page, buf + offset, pagesize);
+			offset += pagesize;
+		}
+		page = 0;
 	}
-
-	return 0;
 }