f3c7ac9696
Instead of using the bootsector to load a bootloader, just put the bootloader in the ROM and call it a day. It looks for a file on the SD card in the root directory named `kernel.bin` and loads it into memory. This is not a perfect solution, as the kernel will grow larger and the kernel load address will have to change. At this point I could add back the bootloader, but that is for later. Also the bootloader is just a copy of the kernel, so that can be trimmed down a lot.
36 lines
1.1 KiB
Plaintext
36 lines
1.1 KiB
Plaintext
MEMORY
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{
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ZP: start = $0, size = $100, type = rw, define = yes;
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SDRAM: start = $200, size = $7cf0, type = rw, define = yes;
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ROM: start = $8000, size = $8000, file = %O;
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}
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SEGMENTS {
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ZEROPAGE: load = ZP, type = zp, define = yes;
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DATA: load = ROM, type = rw, define = yes, run = SDRAM;
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BSS: load = SDRAM, type = bss, define = yes;
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HEAP: load = SDRAM, type = bss, optional = yes;
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STARTUP: load = ROM, type = ro;
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ONCE: load = ROM, type = ro, optional = yes;
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CODE: load = ROM, type = ro;
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RODATA: load = ROM, type = ro;
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VECTORS: load = ROM, type = ro, start = $FFFA;
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}
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FEATURES {
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CONDES: segment = STARTUP,
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type = constructor,
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label = __CONSTRUCTOR_TABLE__,
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count = __CONSTRUCTOR_COUNT__;
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CONDES: segment = STARTUP,
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type = destructor,
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label = __DESTRUCTOR_TABLE__,
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count = __DESTRUCTOR_COUNT__;
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}
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SYMBOLS {
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# Define the stack size for the application
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__STACKSIZE__: value = $0200, type = weak;
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__STACKSTART__: type = weak, value = $0800; # 2k stack
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}
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