Blackfin arch: update BOOT_LOAD

update BOOT_LOAD help to reflect current state of the first 4k of
our address space as well as add a memory range option to prevent
invalid values

Signed-off-by: Mike Frysinger <michael.frysinger@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 17f9469..cdce8cc 100644 (file)
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -476,15 +476,16 @@ config ENET_FLASH_PIN
 config BOOT_LOAD
        hex "Kernel load address for booting"
        default "0x1000"
+       range 0x1000 0x20000000
        help
          This option allows you to set the load address of the kernel.
          This can be useful if you are on a board which has a small amount
          of memory or you wish to reserve some memory at the beginning of
          the address space.
 
-         Note that you generally want to keep this value at or above 4k
-         (0x1000) as this will allow the kernel to capture NULL pointer
-         references.
+         Note that you need to keep this value above 4k (0x1000) as this
+         memory region is used to capture NULL pointer references as well
+         as some core kernel functions.
 
 comment "LED Status Indicators"
        depends on (BFIN533_STAMP || BFIN533_BLUETECHNIX_CM)