On Wed, Dec 04, 2013 at 11:50:48AM +0800, Kuo-Jung Su wrote:
Initial Program Loader (IPL) usually runs with .text and .rodata in ROM, while .data and .bss reside in RAM.
This patch uses the AT keyword to specify load address, and a small code snippet in crt0.S to restore .data section at runtime.
Example usage: Assume the target device has a 4KB ROM at 0x00000000 and a 4KB SRAM at 0xA0000000, the IPL/SPL config could be:
#define CONFIG_SPL_MAX_SIZE 0x1000 /* text + data, no bss */ #define CONFIG_SPL_TEXT_BASE 0x00000000 #define CONFIG_SPL_DATA_BASE 0xA0000000 #define CONFIG_SPL_STACK 0xA0001000
Signed-off-by: Kuo-Jung Su dantesu@gmail.com Cc: Albert Aribaud albert.u.boot@aribaud.net
Can you provide an example user of this functionality? Thanks.