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fix boot2.s

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kicer
2025-12-20 19:16:13 +08:00
parent 397033e293
commit 29edad3437
4 changed files with 37 additions and 628 deletions
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23
scripts/boot1.opt
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@@ -1,9 +1,9 @@
;; M Code
;; option O0 O1 N1 O2 N2 O3 N3 O4 N4 O5 N5
;; 4800 00 00 ff 00 ff 00 ff 00 ff 00 ff -- -- 00 03 d0
;; 03D0|4810 a6 0d c7 52 32 c7 52 35 c7 52 31 a6 80 5f 5c 27
;; 03E0|4820 17 72 0b 52 30 f8 3b 52 31 4c 26 f1 c7 52 31 96
;; 03F0|4830 5c 5c 5c 13 01 26 e4 81 fe 94 72 cc 48 3e 80 04
;; 03D0|4810 a6 0d c7 52 32 c7 52 35 c7 52 31 4f 5f 5c 27 0b
;; 03E0|4820 72 0b 52 30 f8 3b 52 31 4c 20 f1 4d 27 09 96 5c
;; 03F0|4830 5c 5c 13 01 26 01 81 5f fe 94 72 cc 48 3e 80 04
;; UART1 register address definitions
UART1_SR = 0x5230 ; Status register
@@ -33,14 +33,12 @@ _boot_start:
;; Send BREAK signal and version number $0D
ld UART1_DR, A ; [C7 52 31] Send version number 0x0D
;; Receive 128-byte data block and push onto stack
_boot_rx_block:
ld A, #0x80 ; [A6 80]
clr A
_boot_rx_byte:
clrw X ; [5F] Reset X (for timeout detection)
_boot_rx_wait:
incw X ; [5C] Increment X, check for overflow (timeout detection)
jreq _boot_exit ; [27 14] If X overflows (receive timeout), exit
jreq _boot_timeout ; [27 14] If X overflows (receive timeout), exit
;; Wait for data reception
btjf UART1_SR, #5, _boot_rx_wait ;[72 0B 52 30 F8]
@@ -48,23 +46,24 @@ _boot_rx_wait:
;; Data received, push onto stack
push UART1_DR ; [3B 52 31]
inc A ; [4C] Increment A, used as receive counter
jrne _boot_rx_byte ; [26 F1] If A is not 0, continue receiving
;; Receive 128 bytes success
ld UART1_DR, A ; [C7 52 31] Send Ack 0x00
jra _boot_rx_byte ; [26 F1] If A is not 0, continue receiving
_boot_timeout:
tnz A
jreq _boot_exit
;; Check address
ldw X, SP ; [96]
incw X ; [5c]
incw X ; [5c]
incw X ; [5c]
cpw X, (1, SP) ; [13 01]
jrne _boot_rx_block ; [26 E7]
jrne _boot_exit ; [26 E7]
;; Reception complete, jump to received code
ret ; [81] Jump to address at top of stack via ret instruction
_boot_exit:
;; Timeout exit, jump to user program
clrw X
ldw X, (X) ; [FE]
ldw SP, X ; [94]
jp [_boot_go_adr] ; [72 CC 48 3E] Indirect jump