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"
 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.
 
        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)
 
 comment "LED Status Indicators"
        depends on (BFIN533_STAMP || BFIN533_BLUETECHNIX_CM)