I port u-boot to magicarm board based on lpc2290, this board has a nor flash whose address range form 0x80000000 to 0x801fffff ram address(0x81000000-0x817fffff). I modified the micro TEXT_BASE to 0x81080000 and dowmload the u-boot.bin into the flash. the u-boot doesn't work at all . when i modified the micao TEXT_BASE to 0x80000000 and download to flash ,it only work for a while and soon collapsed . who can tell me what the problem is. this is the ld sccript

OUTPUT_FORMAT("elf32-littlearm", "elf32-littlearm", "elf32-littlearm") OUTPUT_ARCH(arm) ENTRY(_start) SECTIONS { . = 0x80000000;

. = ALIGN(4); .text : { cpu/lpc2200/start.o (.text) *(.text) }

. = ALIGN(4); .rodata : { *(.rodata) }

. = ALIGN(4); .data : { *(.data) }

. = ALIGN(4); .got : { *(.got) }

. = .; __u_boot_cmd_start = .; .u_boot_cmd : { *(.u_boot_cmd) } __u_boot_cmd_end = .;

armboot_end_data = .;

. = ALIGN(4); __bss_start = .; .bss : { *(.bss) } _end = .; }

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