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doc: add notes about cross-compiling directly to EEPROM

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I've tested that it works in emulation. The only test left is the
real deal my a Sega Master System.
This commit is contained in:
Virgil Dupras 2020-12-11 21:49:50 -05:00
parent 374a0a8e46
commit 94f5b9d141
1 changed files with 20 additions and 1 deletions
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doc/selfhost.txt
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@ -64,6 +64,26 @@ operation in an inconsistent state. The easiest thing to do it
to restart the operation from scratch. Those error are not
frequent unless hardware is faulty.
# Cross-compiling directly to EEPROM
If your target media is a RAM mappable media, you can save prec-
ious RAM by cross-compiling Collapse OS directly to it. It req-
uires special handling.
You can begin the process in a regular manner, but right before
you're about to assemble the boot code, take a pause.
Up until now, you've been loading your cross compiling tools in
RAM, now, you're about to write Collapse OS. So what you need
to do is change HERE to the address of your EEPROM. Example:
0x2000 HERE !
If you need to activate special system overrides such as the
one described in doc/hw/at28.txt, now is the time.
Then, you can continue the process normally.
# Verifying
You can use "/tools/memdump" to dump the memory between your
@ -76,4 +96,3 @@ back to after your ending offset so that you don't overwrite
your binary.
Then, you can run "/tools/memdump".