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mirror of synced 2026-01-12 00:02:46 +00:00

Add BootROM support.

This commit is contained in:
Matthieu Bucchianeri 2025-01-12 00:36:46 -08:00 committed by Ted Fried
parent 5662d3988e
commit d2f95788e5
7 changed files with 265 additions and 2 deletions

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@ -37,7 +37,10 @@
//
// Revision 7 01/12/2025
// - Refactor SD card I/O
// - Add support for 16-bit EMS page offsets.
// - Add support for 16-bit EMS page offsets
//
// Revision 8 01/18/2024
// - Add support for BIOS ROM extension (Boot ROM)
//
// Revision 8 01/20/2025
// - Added chip select for a second PSRAM to allow access to 16 MB of Expanded RAM
@ -71,6 +74,8 @@
#include <stdint.h>
#include <stdio.h>
#include "bootrom.h"
// Teensy 4.1 pin assignments
//
@ -573,6 +578,16 @@ inline void Mem_Read_Cycle() {
GPIO8_DR = sd_pin_outputs + MUX_DATA_n_HIGH + CHRDY_OE_n_HIGH + DATA_OE_n_HIGH;
}
else if (isa_address>=BOOTROM_ADDR && isa_address<BOOTROM_ADDR+sizeof(BOOTROM)) { // Boot ROM
isa_data_out = BOOTROM[isa_address-BOOTROM_ADDR];
GPIO7_DR = GPIO7_DATA_OUT_UNSCRAMBLE + MUX_ADDR_n_LOW + CHRDY_OUT_LOW + trigger_out;
GPIO8_DR = sd_pin_outputs + MUX_DATA_n_HIGH + CHRDY_OE_n_HIGH + DATA_OE_n_LOW;
while ( (gpio9_int&0xF0) != 0xF0 ) { gpio9_int = GPIO9_DR; } // Wait here until cycle is complete
GPIO8_DR = sd_pin_outputs + MUX_DATA_n_HIGH + CHRDY_OE_n_HIGH + DATA_OE_n_HIGH;
}
return;
}
@ -612,7 +627,6 @@ inline void Mem_Write_Cycle() {
GPIO7_DR = GPIO7_DATA_OUT_UNSCRAMBLE + MUX_ADDR_n_LOW + CHRDY_OUT_LOW + trigger_out;
GPIO8_DR = sd_pin_outputs + MUX_DATA_n_HIGH + CHRDY_OE_n_HIGH + DATA_OE_n_HIGH;
}
else if (isa_address<0xA0000) { // XTMax stores the full 640 KB conventional memory
GPIO7_DR = GPIO7_DATA_OUT_UNSCRAMBLE + MUX_ADDR_n_HIGH + CHRDY_OUT_LOW + trigger_out;
GPIO8_DR = sd_pin_outputs + MUX_DATA_n_LOW + CHRDY_OE_n_HIGH + DATA_OE_n_HIGH;

130
XTMax/Code/XTMax/bootrom.h Normal file
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@ -0,0 +1,130 @@
#define BOOTROM_ADDR 0xCE000
unsigned char BOOTROM[] = {
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2
XTMax/Drivers/BootROM/.gitignore vendored Normal file
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@ -0,0 +1,2 @@
bootrom
bootrom.com

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@ -0,0 +1,20 @@
{
// See https://go.microsoft.com/fwlink/?LinkId=733558
// for the documentation about the tasks.json format
"version": "2.0.0",
"tasks": [
{
"label": "Build with NASM",
"type": "shell",
"command": ".\\build.cmd",
"options": {
"cwd": "${workspaceFolder}"
},
"problemMatcher": [],
"group": {
"kind": "build",
"isDefault": true
}
}
]
}

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@ -0,0 +1,72 @@
bits 16
%ifndef AS_COM
;
; BIOS will look for the AA55 signature between C8000-DFFFF in 2KB increments.
; We choose an address in that range.
;
org 0xce000
dw 0AA55h
db 4 ; times 512 bytes
%else
;
; Building as a COM file for testing.
;
org 0x100
%endif
entry:
%ifndef AS_COM
mov ax, 0xc000
mov ds, ax
mov es, ax
%endif
mov si, welcome
call print_string
%ifndef AS_COM
retf
%else
;
; DOS exit program.
;
mov ah, 0x4c
xor al, al
int 0x21
%endif
;
; Utilities
;
print_string:
push bx
xor bx,bx
.loop:
lodsb
or al, al
jz .done
mov ah, 0x0E
int 0x10
jmp .loop
.done:
pop bx
ret
;
; Strings
;
welcome db 'BootROM for XTMax v0.1', 0x0D, 0x0A, 0
%ifndef AS_COM
;
; Pad to 2KB. We will try to keep our ROM under that size.
;
times 2047-($-$$) db 0
db 0 ; will be used to complete the checksum.
%endif

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@ -0,0 +1,2 @@
..\Driver_Build_Tools\NASM\nasm.exe -f bin -o bootrom.com -DAS_COM .\bootrom.asm
..\Driver_Build_Tools\NASM\nasm.exe -f bin -o bootrom .\bootrom.asm & python checksum.py

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@ -0,0 +1,23 @@
# https://stackoverflow.com/questions/53808694/how-do-i-format-a-python-list-as-an-initialized-c-array
def to_c_array(values, ctype="float", name="table", formatter=str, colcount=8):
# apply formatting to each element
values = [formatter(v) for v in values]
# split into rows with up to `colcount` elements per row
rows = [values[i:i+colcount] for i in range(0, len(values), colcount)]
# separate elements with commas, separate rows with newlines
body = ',\n '.join([', '.join(r) for r in rows])
# assemble components into the complete string
return '{} {}[] = {{\n {}}};'.format(ctype, name, body)
with open("bootrom", "rb") as f:
b = bytearray(f.read())
# compute the checksum and store a byte to
b[-1] = 256 - sum(b[0:-1]) & 0xff
with open("bootrom", "wb") as f:
f.write(b)
with open("../../Code/XTMax/bootrom.h", "w") as f:
f.write("#define BOOTROM_ADDR 0xCE000\n")
f.write(to_c_array(b, ctype="unsigned char", name="BOOTROM", colcount=16))