summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorGrant Likely <grant.likely@linaro.org>2011-03-28 09:58:43 +0000
committerGerald Van Baren <gvb@unssw.com>2011-04-25 21:11:20 -0400
commitc3624e6ed0a36f54aa0b3e7f32d30a6fde434f51 (patch)
tree9a9de9718b28b0a526708466f5eb12782352607d
parent590d3cacb98cb377b127869b58507d2afe9c904a (diff)
downloadu-boot-imx-c3624e6ed0a36f54aa0b3e7f32d30a6fde434f51.zip
u-boot-imx-c3624e6ed0a36f54aa0b3e7f32d30a6fde434f51.tar.gz
u-boot-imx-c3624e6ed0a36f54aa0b3e7f32d30a6fde434f51.tar.bz2
Default to bootm_size() when CONFIG_SYS_BOOTMAPSZ is not defined
This patch adds a function getenv_bootm_mapsize() for obtaining the size of the early mapped region accessible by the kernel during early boot. It defaults to CONFIG_SYS_BOOTMAPSZ, or if not defined, defaults to getenv_bootm_size(), which in turn defaults to the size of RAM. getenv_bootm_mapsize() can also be overridden with a "bootm_mapsize" environmental variable. Signed-off-by: Grant Likely <grant.likely@linaro.org>
-rw-r--r--README16
-rw-r--r--arch/powerpc/lib/bootm.c2
-rw-r--r--common/image.c22
-rw-r--r--include/image.h1
4 files changed, 35 insertions, 6 deletions
diff --git a/README b/README
index cdbb9de..b647eca 100644
--- a/README
+++ b/README
@@ -2348,7 +2348,10 @@ Configuration Settings:
used) must be put below this limit, unless "bootm_low"
enviroment variable is defined and non-zero. In such case
all data for the Linux kernel must be between "bootm_low"
- and "bootm_low" + CONFIG_SYS_BOOTMAPSZ.
+ and "bootm_low" + CONFIG_SYS_BOOTMAPSZ. The environment
+ variable "bootm_mapsize" will override the value of
+ CONFIG_SYS_BOOTMAPSZ. If CONFIG_SYS_BOOTMAPSZ is undefined,
+ then the value in "bootm_size" will be used instead.
- CONFIG_SYS_BOOT_RAMDISK_HIGH:
Enable initrd_high functionality. If defined then the
@@ -3184,7 +3187,16 @@ List of environment variables (most likely not complete):
for use by the bootm command. See also "bootm_size"
environment variable. Address defined by "bootm_low" is
also the base of the initial memory mapping for the Linux
- kernel -- see the description of CONFIG_SYS_BOOTMAPSZ.
+ kernel -- see the description of CONFIG_SYS_BOOTMAPSZ and
+ bootm_mapsize.
+
+ bootm_mapsize - Size of the initial memory mapping for the Linux kernel.
+ This variable is given as a hexadecimal number and it
+ defines the size of the memory region starting at base
+ address bootm_low that is accessible by the Linux kernel
+ during early boot. If unset, CONFIG_SYS_BOOTMAPSZ is used
+ as the default value if it is defined, and bootm_size is
+ used otherwise.
bootm_size - Memory range available for image processing in the bootm
command can be restricted. This variable is given as
diff --git a/arch/powerpc/lib/bootm.c b/arch/powerpc/lib/bootm.c
index 6e2a81b..02e544f 100644
--- a/arch/powerpc/lib/bootm.c
+++ b/arch/powerpc/lib/bootm.c
@@ -96,7 +96,7 @@ static void boot_jump_linux(bootm_headers_t *images)
debug (" Booting using OF flat tree...\n");
WATCHDOG_RESET ();
(*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
- CONFIG_SYS_BOOTMAPSZ, 0, 0);
+ getenv_bootm_mapsize(), 0, 0);
/* does not return */
} else
#endif
diff --git a/common/image.c b/common/image.c
index c86b86f..d8ba2ab 100644
--- a/common/image.c
+++ b/common/image.c
@@ -454,6 +454,22 @@ phys_size_t getenv_bootm_size(void)
#endif
}
+phys_size_t getenv_bootm_mapsize(void)
+{
+ phys_size_t tmp;
+ char *s = getenv ("bootm_mapsize");
+ if (s) {
+ tmp = (phys_size_t)simple_strtoull (s, NULL, 16);
+ return tmp;
+ }
+
+#if defined(CONFIG_SYS_BOOTMAPSZ)
+ return CONFIG_SYS_BOOTMAPSZ;
+#else
+ return getenv_bootm_size();
+#endif
+}
+
void memmove_wd (void *to, void *from, size_t len, ulong chunksz)
{
if (to == from)
@@ -1207,7 +1223,7 @@ int boot_relocate_fdt (struct lmb *lmb, char **of_flat_tree, ulong *of_size)
/* Pad the FDT by a specified amount */
of_len = *of_size + CONFIG_SYS_FDT_PAD;
of_start = (void *)(unsigned long)lmb_alloc_base(lmb, of_len, 0x1000,
- CONFIG_SYS_BOOTMAPSZ + getenv_bootm_low());
+ getenv_bootm_mapsize() + getenv_bootm_low());
if (of_start == 0) {
puts("device tree - allocation error\n");
@@ -1581,7 +1597,7 @@ int boot_get_cmdline (struct lmb *lmb, ulong *cmd_start, ulong *cmd_end)
char *s;
cmdline = (char *)(ulong)lmb_alloc_base(lmb, CONFIG_SYS_BARGSIZE, 0xf,
- CONFIG_SYS_BOOTMAPSZ + getenv_bootm_low());
+ getenv_bootm_mapsize() + getenv_bootm_low());
if (cmdline == NULL)
return -1;
@@ -1617,7 +1633,7 @@ int boot_get_cmdline (struct lmb *lmb, ulong *cmd_start, ulong *cmd_end)
int boot_get_kbd (struct lmb *lmb, bd_t **kbd)
{
*kbd = (bd_t *)(ulong)lmb_alloc_base(lmb, sizeof(bd_t), 0xf,
- CONFIG_SYS_BOOTMAPSZ + getenv_bootm_low());
+ getenv_bootm_mapsize() + getenv_bootm_low());
if (*kbd == NULL)
return -1;
diff --git a/include/image.h b/include/image.h
index 792de25..8c40557 100644
--- a/include/image.h
+++ b/include/image.h
@@ -451,6 +451,7 @@ int image_check_dcrc (const image_header_t *hdr);
int getenv_yesno (char *var);
ulong getenv_bootm_low(void);
phys_size_t getenv_bootm_size(void);
+phys_size_t getenv_bootm_mapsize(void);
void memmove_wd (void *to, void *from, size_t len, ulong chunksz);
#endif