[U-Boot] [PATCH v3] Add support for boards where the NOR FLASH is not memory-mapped
Stefan Roese
sr at denx.de
Thu Dec 11 12:11:14 CET 2008
This patch adds the CONFIG_FLASH_NOT_MEM_MAPPED define which can be
used on boards where the NOR FLASH is not memory-mapped and
special accessor functions are needed to access the NOR FLASH.
This affects the memory commands (cmd_mem.c) and the environment
(env_flash.c).
Boards using CONFIG_FLASH_NOT_MEM_MAPPED need to additionally specify
CONFIG_FLASH_BASE and CONFIG_FLASH_END so that the NOR FLASH region
can be detected.
This will be used by the upcoming VCT board support.
Signed-off-by: Stefan Roese <sr at denx.de>
---
v3:
- Removed some gratuitous underscores in function parameters
- Prototypes moved to header (common.h)
- Removed ";" after macro definition
v2:
- Added configuration option description to the README
- Fix bug in NOR FLASH end detection in env_flash.c (spotted by Wolfgang)
- Further "cleanup" of the env_flash code supporting non memory-mapped
NOR FLASH.
- Macros in crc32.h now wrapped in "do { ... } while (0)" as suggested by
Wolfgang
README | 17 +++++++++++++
common/cmd_mem.c | 64 +++++++++++++++++++++++++++++++++++++-----------
common/env_flash.c | 66 +++++++++++++++++++++++++++++++++++++++++----------
include/common.h | 8 ++++++
lib_generic/crc32.c | 26 +++++++++++++++++---
5 files changed, 149 insertions(+), 32 deletions(-)
diff --git a/README b/README
index 2a553c2..3414d66 100644
--- a/README
+++ b/README
@@ -2198,6 +2198,23 @@ Configuration Settings:
digits and dots. Recommended value: 45 (9..1) for 80
column displays, 15 (3..1) for 40 column displays.
+- CONFIG_FLASH_NOT_MEM_MAPPED
+ Unfortunately there are boards, where the NOR FLASH can't
+ be accessed memory mapped. So we needed to find a way to
+ access those FLASH's from the CFI driver and the environment.
+ For the non-memory-mapped NOR FLASH, we need to define the
+ NOR FLASH area. This can't be detected via the addr2info()
+ function, since we check for flash access in the very early
+ U-Boot code, before the NOR FLASH is detected. So we need
+ to additionally define the following options to configure
+ the NOR FLASH range:
+
+ - CONFIG_FLASH_BASE
+ Starting address of the NOR FLASH area
+
+ - CONFIG_FLASH_END
+ Highest possible address of the NOR FLASH area
+
- CONFIG_SYS_RX_ETH_BUFFER:
Defines the number of Ethernet receive buffers. On some
Ethernet controllers it is recommended to set this value
diff --git a/common/cmd_mem.c b/common/cmd_mem.c
index d7666c2..29eda3e 100644
--- a/common/cmd_mem.c
+++ b/common/cmd_mem.c
@@ -43,6 +43,41 @@
#define PRINTF(fmt,args...)
#endif
+#if defined(CONFIG_HAS_DATAFLASH)
+#define CONFIG_FLASH_NOT_MEM_MAPPED
+#define OK DATAFLASH_OK
+#endif
+
+#if !defined(OK)
+#define OK 1
+#endif
+
+#if defined(CONFIG_FLASH_NOT_MEM_MAPPED)
+static inline int flash_read(void *to, const void *from, int n)
+{
+#if defined(CONFIG_HAS_DATAFLASH)
+ return read_dataflash(from, n, to);
+#elif defined(CONFIG_FLASH_NOT_MEM_MAPPED)
+ if ((addr2info((u32)from) != NULL))
+ board_flash_read_memcpy(to, from, n);
+ else
+ memcpy(to, from, n);
+ return OK;
+#endif
+}
+#endif /* defined(CONFIG_FLASH_NOT_MEM_MAPPED) */
+
+static inline int is_flash_addr(u32 addr)
+{
+#if defined(CONFIG_HAS_DATAFLASH)
+ return addr_dataflash(addr);
+#elif defined(CONFIG_FLASH_NOT_MEM_MAPPED)
+ return (addr2info(addr) != NULL);
+#else
+ return 1;
+#endif
+}
+
static int mod_mem(cmd_tbl_t *, int, int, int, char *[]);
/* Display values from last command.
@@ -63,7 +98,7 @@ static ulong base_address = 0;
int do_mem_md ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
ulong addr, length;
-#if defined(CONFIG_HAS_DATAFLASH)
+#if defined(CONFIG_FLASH_NOT_MEM_MAPPED)
ulong nbytes, linebytes;
#endif
int size;
@@ -100,7 +135,7 @@ int do_mem_md ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
length = simple_strtoul(argv[2], NULL, 16);
}
-#if defined(CONFIG_HAS_DATAFLASH)
+#if defined(CONFIG_FLASH_NOT_MEM_MAPPED)
/* Print the lines.
*
* We buffer all read data, so we can make sure data is read only
@@ -112,10 +147,13 @@ int do_mem_md ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
void* p;
linebytes = (nbytes>DISP_LINE_LEN)?DISP_LINE_LEN:nbytes;
- rc = read_dataflash(addr, (linebytes/size)*size, linebuf);
- p = (rc == DATAFLASH_OK) ? linebuf : (void*)addr;
+ rc = flash_read(linebuf, (void *)addr, (linebytes/size)*size);
+ p = (rc == OK) ? linebuf : (void *)addr;
print_buffer(addr, p, size, linebytes/size, DISP_LINE_LEN/size);
+ /* Clear rc, otherwise command repeat doesn't work */
+ rc = 0;
+
nbytes -= linebytes;
addr += linebytes;
if (ctrlc()) {
@@ -294,9 +332,9 @@ int do_mem_cmp (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
count = simple_strtoul(argv[3], NULL, 16);
-#ifdef CONFIG_HAS_DATAFLASH
- if (addr_dataflash(addr1) | addr_dataflash(addr2)){
- puts ("Comparison with DataFlash space not supported.\n\r");
+#ifdef CONFIG_FLASH_NOT_MEM_MAPPED
+ if (is_flash_addr(addr1) || is_flash_addr(addr2)) {
+ puts ("Comparison with FLASH space not supported.\n\r");
return 0;
}
#endif
@@ -385,11 +423,7 @@ int do_mem_cp ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
#ifndef CONFIG_SYS_NO_FLASH
/* check if we are copying to Flash */
- if ( (addr2info(dest) != NULL)
-#ifdef CONFIG_HAS_DATAFLASH
- && (!addr_dataflash(dest))
-#endif
- ) {
+ if (is_flash_addr(dest)) {
int rc;
puts ("Copy to Flash... ");
@@ -1010,9 +1044,9 @@ mod_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char *argv[])
addr += base_address;
}
-#ifdef CONFIG_HAS_DATAFLASH
- if (addr_dataflash(addr)){
- puts ("Can't modify DataFlash in place. Use cp instead.\n\r");
+#ifdef CONFIG_FLASH_NOT_MEM_MAPPED
+ if (is_flash_addr(addr)) {
+ puts ("Can't modify FLASH in place. Use cp instead.\n\r");
return 0;
}
#endif
diff --git a/common/env_flash.c b/common/env_flash.c
index 75ee8dd..becc0dc 100644
--- a/common/env_flash.c
+++ b/common/env_flash.c
@@ -85,9 +85,46 @@ static ulong end_addr_new = CONFIG_ENV_ADDR_REDUND + CONFIG_ENV_SECT_SIZE - 1;
extern uchar default_environment[];
extern int default_environment_size;
+#if defined(CONFIG_FLASH_NOT_MEM_MAPPED)
+#define FLASH_READ_MEMCPY(d, s, n) board_flash_read_memcpy(d, s, n)
+#else
+#define FLASH_READ_MEMCPY(d, s, n) memcpy(d, s, n)
+#endif /* CONFIG_FLASH_NOT_MEM_MAPPED */
+
+/*
+ * On boards where the NOR FLASH is not memory mapped, this function
+ * returns 1 when the address is in the NOR FLASH range. On "normal" boards,
+ * where the NOR FLASH is memory mapped this function always returns 0.
+ * This way GCC removes the true path in the following functions calling
+ * addr_in_flash_range() by optimization.
+ */
+static inline int addr_in_flash_range(u32 addr)
+{
+#if defined(CONFIG_FLASH_NOT_MEM_MAPPED)
+ if ((addr >= CONFIG_FLASH_BASE) && (addr <= CONFIG_FLASH_END))
+ return 1;
+#endif
+ return 0;
+}
+
+static inline u8 read_env8(u8 *addr)
+{
+ if (addr_in_flash_range((u32)addr))
+ return flash_read8((void *)addr);
+ return *addr;
+}
+
+static inline u32 read_env32(u32 *addr)
+{
+ if (addr_in_flash_range((u32)addr))
+ return flash_read32((void *)addr);
+ return *addr;
+}
uchar env_get_char_spec (int index)
{
+ if (addr_in_flash_range((u32)gd->env_addr))
+ return (flash_read8((void *)gd->env_addr + index));
return ( *((uchar *)(gd->env_addr + index)) );
}
@@ -97,15 +134,17 @@ int env_init(void)
{
int crc1_ok = 0, crc2_ok = 0;
- uchar flag1 = flash_addr->flags;
- uchar flag2 = flash_addr_new->flags;
+ uchar flag1 = read_env8(&flash_addr->flags);
+ uchar flag2 = read_env8(&flash_addr_new->flags);
ulong addr_default = (ulong)&default_environment[0];
ulong addr1 = (ulong)&(flash_addr->data);
ulong addr2 = (ulong)&(flash_addr_new->data);
- crc1_ok = (crc32(0, flash_addr->data, ENV_SIZE) == flash_addr->crc);
- crc2_ok = (crc32(0, flash_addr_new->data, ENV_SIZE) == flash_addr_new->crc);
+ crc1_ok = (crc32(0, flash_addr->data, ENV_SIZE) ==
+ read_env32(&flash_addr->crc));
+ crc2_ok = (crc32(0, flash_addr_new->data, ENV_SIZE) ==
+ read_env32(&flash_addr_new->crc));
if (crc1_ok && ! crc2_ok) {
gd->env_addr = addr1;
@@ -169,8 +208,9 @@ int saveenv(void)
up_data);
goto Done;
}
- memcpy(saved_data,
- (void *)((long)flash_addr_new + CONFIG_ENV_SIZE), up_data);
+ FLASH_READ_MEMCPY(saved_data,
+ (void *)((long)flash_addr_new + CONFIG_ENV_SIZE),
+ up_data);
debug ("Data (start 0x%x, len 0x%x) saved at 0x%x\n",
(long)flash_addr_new + CONFIG_ENV_SIZE,
up_data, saved_data);
@@ -246,7 +286,7 @@ Done:
int env_init(void)
{
- if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
+ if (crc32(0, env_ptr->data, ENV_SIZE) == read_env32(&env_ptr->crc)) {
gd->env_addr = (ulong)&(env_ptr->data);
gd->env_valid = 1;
return(0);
@@ -282,7 +322,7 @@ int saveenv(void)
flash_sect_addr, (ulong)flash_addr, flash_offset);
/* copy old contents to temporary buffer */
- memcpy (env_buffer, (void *)flash_sect_addr, CONFIG_ENV_SECT_SIZE);
+ FLASH_READ_MEMCPY(env_buffer, (void *)flash_sect_addr, CONFIG_ENV_SECT_SIZE);
/* copy current environment to temporary buffer */
memcpy ((uchar *)((unsigned long)env_buffer + flash_offset),
@@ -346,9 +386,9 @@ void env_relocate_spec (void)
end_addr_new = ltmp;
}
- if (flash_addr_new->flags != OBSOLETE_FLAG &&
+ if (read_env8(&flash_addr_new->flags) != OBSOLETE_FLAG &&
crc32(0, flash_addr_new->data, ENV_SIZE) ==
- flash_addr_new->crc) {
+ read_env32(&flash_addr_new->crc)) {
char flag = OBSOLETE_FLAG;
gd->env_valid = 2;
@@ -359,8 +399,8 @@ void env_relocate_spec (void)
flash_sect_protect (1, (ulong)flash_addr_new, end_addr_new);
}
- if (flash_addr->flags != ACTIVE_FLAG &&
- (flash_addr->flags & ACTIVE_FLAG) == ACTIVE_FLAG) {
+ if (read_env8(&flash_addr->flags) != ACTIVE_FLAG &&
+ (read_env8(&flash_addr->flags) & ACTIVE_FLAG) == ACTIVE_FLAG) {
char flag = ACTIVE_FLAG;
gd->env_valid = 2;
@@ -376,7 +416,7 @@ void env_relocate_spec (void)
"reading environment; recovered successfully\n\n");
#endif /* CONFIG_ENV_ADDR_REDUND */
#ifdef CMD_SAVEENV
- memcpy (env_ptr, (void*)flash_addr, CONFIG_ENV_SIZE);
+ FLASH_READ_MEMCPY(env_ptr, (void*)flash_addr, CONFIG_ENV_SIZE);
#endif
#endif /* ! ENV_IS_EMBEDDED || CONFIG_ENV_ADDR_REDUND */
}
diff --git a/include/common.h b/include/common.h
index 5968036..18687c6 100644
--- a/include/common.h
+++ b/include/common.h
@@ -716,6 +716,14 @@ int cpu_reset(int nr);
int cpu_release(int nr, int argc, char *argv[]);
#endif
+/*
+ * Functions only needed when CONFIG_FLASH_NOT_MEM_MAPPED is defined
+ * for boards where the NOR FLASH can't be accessed memory-mapped.
+ */
+void *board_flash_read_memcpy(void *to, const void *from, size_t n);
+u8 flash_read8(void *addr);
+u32 flash_read32(void *addr);
+
#ifdef CONFIG_POST
#define CONFIG_HAS_POST
#endif
diff --git a/lib_generic/crc32.c b/lib_generic/crc32.c
index b6a7a91..9067209 100644
--- a/lib_generic/crc32.c
+++ b/lib_generic/crc32.c
@@ -148,10 +148,28 @@ const uint32_t * ZEXPORT get_crc_table()
#endif
/* ========================================================================= */
-#define DO1(buf) crc = crc_table[((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8);
-#define DO2(buf) DO1(buf); DO1(buf);
-#define DO4(buf) DO2(buf); DO2(buf);
-#define DO8(buf) DO4(buf); DO4(buf);
+#if defined(CONFIG_FLASH_NOT_MEM_MAPPED)
+#define DO1(buf) \
+ do { \
+ if (((u32)buf >= CONFIG_FLASH_BASE) && \
+ ((u32)buf <= CONFIG_FLASH_END)) { \
+ crc = crc_table[ ((int)crc ^ \
+ (flash_read8((void *)buf++))) & 0xff] ^ \
+ (crc >> 8); \
+ } else { \
+ crc = crc_table[((int)crc ^ \
+ (*buf++)) & 0xff] ^ (crc >> 8); \
+ } \
+ } while (0)
+#else
+#define DO1(buf) \
+ do { \
+ crc = crc_table[((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8); \
+ } while (0)
+#endif
+#define DO2(buf) do { DO1(buf); DO1(buf); } while (0)
+#define DO4(buf) do { DO2(buf); DO2(buf); } while (0)
+#define DO8(buf) do { DO4(buf); DO4(buf); } while (0)
/* ========================================================================= */
uint32_t ZEXPORT crc32 (uint32_t crc, const Bytef *buf, uInt len)
--
1.6.0.5
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