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55 lines
2.3 KiB
Markdown
55 lines
2.3 KiB
Markdown
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# Assembling Collapse OS from within it
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This is where we tie lose ends, complete the circle, loop the loop: we assemble
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a new Collapse OS *entirely* from within Collapse OS and write it to EEPROM,
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either for another RC2014 or for an OS upgrade.
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## Gathering parts
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* stage4 from `sdcard` recipe. If you want to write to EEPROM as the final step,
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you'll need a hybrid stage4 that also includes stuff from the `eeprom` recipe.
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## Building stage 1
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### Part 1
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Building the first part of stage 1 (the binary part, before the inlined-source
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part) from within Collapse OS is actually very similar from building it from a
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modern environment. If you take the time to look at the base recipe `Makefile`,
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you'll see `cat xcomp.fs | $(STAGE2)`. That command builds part 1. Open
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`xcomp.fs` in a text editor and take a look at it.
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To assemble stage 1 from RC2014, all you need to do is to type those commands
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in the same order, and replace the `H@ 256 /MOD 2 PC! 2 PC!` lines with `H@ .X`.
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Those commands will inform you of the begin/end offsets of the assembled binary.
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The meaning of these commands is not explained here. You are encouraged to read
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the in-system documentation for more information.
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However, one thing you should know is that because the SD card driver is a bit
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slow, some of these commands take a long time. Multiple minutes. Be patient.
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Once all your commands are run and that you have your begin/end offset (write
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them down somewhere), you're ready to assemble part 2.
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### What to do on SDerr?
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If you get `SDerr` in the middle of a LOAD operation, something went wrong with
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the SD card. The bad news is that it left your xcomp operation in an
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inconsistent state. If your at the beginning of it, it's easier to restart it
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entirely.
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If you're towards the end, you might want to repair it. To do so, you'll have to
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bring your `XCURRENT` and `HERE` values to where they were before the LOAD
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operation. You could have thought ahead and printed them before the LOAD, but if
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you didn't, you'll just have to dig in your memory with `DUMP`.
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You're looking at the offset of the last wordref of the *previous* LOAD
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operation. That offset is going in `XCURRENT`. Then, you're looking at the end
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of that word. That offset goes in `HERE`. Once you've done that, relaunch your
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LOAD.
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### Part 2
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TODO
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