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Allow fixup to be repeated.

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There are scenarios in which it is beneficial to search for an Etherne chip at several i/o locations. To do so the chip initialization is performed at several i/o locations until it succeeds. In order to allow for that operation model the i/o location fixup needs to be repeatable.

Note: This won't work with the RR-Net because the fixup bits overlap with the chip i/o bits.
This commit is contained in:
Oliver Schmidt 2015-07-09 22:43:16 +02:00
parent a30e2e0045
commit f348f4feb2
3 changed files with 47 additions and 41 deletions
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18
cpu/6502/net/cs8900a.S
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@ -92,12 +92,13 @@ fixups = * - fixup
;---------------------------------------------------------------------
rxtxreg := $FF00 ; High byte patched at runtime
txcmd := $FF04 ; High byte patched at runtime
txlen := $FF06 ; High byte patched at runtime
isq := $FF08 ; High byte patched at runtime
packetpp := $FF0A ; High byte patched at runtime
ppdata := $FF0C ; High byte patched at runtime
; 3 most significant nibbles are fixed up at runtime
rxtxreg := $FFF0
txcmd := $FFF4
txlen := $FFF6
isq := $FFF8
packetpp := $FFFA
ppdata := $FFFC
.data
@ -117,8 +118,9 @@ init:
ldy #$00
; Fixup address at location
: lda reg
eor (ptr),y ; Use XOR to support C64 RR-Net
: lda (ptr),y
and #$0F
eor reg ; Use XOR to support C64 RR-Net
sta (ptr),y
iny
lda reg+1