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Rename boot to bios, add sd call

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Adds a call that you can make to the BIOS to read sd blocks. Useful for
the bootloader where there is not much space
This commit is contained in:
Byron Lathi
2022-04-18 20:24:29 -05:00
parent 64f6f0b397
commit 54328722ab
10 changed files with 72 additions and 9 deletions
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19
sw/bios/link.ld Normal file
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@@ -0,0 +1,19 @@
MEMORY
{
ZP: start = $0, size = $100, type = rw, define = yes;
SDRAM: start = $1000, size = $6ef0, type = rw, define = yes;
ROM: start = $8000, size = $8000, fill = yes, fillval = $ff, file = %O;
}
SEGMENTS {
ZEROPAGE: load = ZP, type = zp, define = yes;
DATA: load = ROM, type = rw, define = yes, run = SDRAM;
BSS: load = SDRAM, type = bss, define = yes;
HEAP: load = SDRAM, type = bss, optional = yes;
STARTUP: load = ROM, type = ro;
ONCE: load = ROM, type = ro, optional = yes;
CODE: load = ROM, type = ro;
RODATA: load = ROM, type = ro;
VECTORS: load = ROM, type = ro, start = $FFFA;
}