Hello,
I am working on a custom bootloader. For the time being I am trying to the main
code to a higher address and create a custom section to hold the bootloader
code.
After modifying the memory.x file in lib/ldscripts/ I have created a new region
called "bootldr" and moved the "rom" up by 8K to 0x5100:
memory.x :
MEMORY {
sfr : ORIGIN = 0x0000, LENGTH = 0x0010 /* END=0x0010, size 16 */
peripheral_8bit : ORIGIN = 0x0010, LENGTH = 0x00f0 /* END=0x0100, size 240 */
peripheral_16bit : ORIGIN = 0x0100, LENGTH = 0x0100 /* END=0x0200, size 256 */
infomem : ORIGIN = 0x1000, LENGTH = 0x0100 /* END=0x1100, size 256 */
infod : ORIGIN = 0x1000, LENGTH = 0x0040 /* END=0x1040, size 64 */
infoc : ORIGIN = 0x1040, LENGTH = 0x0040 /* END=0x1080, size 64 */
infob : ORIGIN = 0x1080, LENGTH = 0x0040 /* END=0x10c0, size 64 */
infoa : ORIGIN = 0x10c0, LENGTH = 0x0040 /* END=0x1100, size 64 */
ram (wx) : ORIGIN = 0x1100, LENGTH = 0x2000 /* END=0x3100, size 8K */
bootldr (rx) : ORIGIN = 0x3100, LENGTH = 0x2000 /* END=0x5100, size 8K */
rom (rx) : ORIGIN = 0x5100, LENGTH = 0xaec0 /* END=0xffc0, size 44736
*/
vectors : ORIGIN = 0xffc0, LENGTH = 0x0040 /* END=0x10000, size 64 */
far_rom : ORIGIN = 0x00010000, LENGTH = 0x0000a000 /*
END=0x0001a000,
size 40K */
/* Remaining banks are absent */
bsl : ORIGIN = 0x0000, LENGTH = 0x0000
}
REGION_ALIAS("REGION_BOOTLDR", bootldr);
REGION_ALIAS("REGION_TEXT", rom);
REGION_ALIAS("REGION_DATA", ram);
REGION_ALIAS("REGION_FAR_ROM", far_rom);
After reading further I concluded that what I need is a separate section, not
defining a memory region. But, from there on, everything gets foggy so I would
need a little help to point me in the right direction: writing a custom linker
file for msp430 and maybe a small example of such a file.
Thank you,
Alex
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