FreeCalypso > hg > freecalypso-reveng
diff bootrom.notes @ 8:a06573cacb6e
boot ROM re: trying to understand the code that runs after '<' received
| author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
|---|---|
| date | Wed, 17 Apr 2013 06:25:19 +0000 |
| parents | a445735685ba |
| children | 25b016d16602 |
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--- a/bootrom.notes Tue Apr 16 20:56:31 2013 +0000 +++ b/bootrom.notes Wed Apr 17 06:25:19 2013 +0000 @@ -37,11 +37,19 @@ 80001C 7 words: hard vectors: the physical vector locations in the ROM contain branch instructions to these 7 RAM addresses - +800038: The helper routine for transferring control to type 1 flash images + is copied to and run here. +800100: the last word of the above routine 800104: word initialized to 0x0001D4C0 800108: byte initialized to 0x01 -800534: byte initialized to 0x00 +800520: byte variable filled every time the 0xfb4 routine is called + holds the ID of the UART on which '<' came in, or FF if none +800524: byte variable filled every time the 0xfb4 routine is called + filled with a copy of 800534 + +800534: byte initialized to 0x00, then may be set to 1 by the 0xfb4 + routine if it selects /1 clock mode. 8005C0: appears to be the intended low address (bottom) of the stack 80074C: top of the stack (initial value loaded into SP)