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https://github.com/hsoft/collapseos.git
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tools: add smsrom
Running a ROM on an everdrive is one thing, but running a ROM directly is another: my hacked up sega.bin didn't have a proper checksum, so the ROM didn't run. This new tool transforms a binary into a properly-headered ROM. Has been tested on an actual SMS.
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commit
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@ -2,6 +2,7 @@ TARGET = os.bin
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BASE = ../../
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STAGE = $(BASE)/cvm/stage
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BLKPACK = $(BASE)/tools/blkpack
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SMSROM = $(BASE)/tools/smsrom
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EMUL = $(BASE)/emul/hw/sms/sms
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.PHONY: all
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@ -9,6 +10,7 @@ all: $(TARGET)
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$(TARGET): xcomp.fs $(STAGE) blkfs
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cat xcomp.fs | $(STAGE) blkfs > $@
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$(SMSROM):
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$(BLKPACK):
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$(MAKE) -C ../tools
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@ -18,8 +20,8 @@ blkfs: $(BLKPACK)
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$(STAGE):
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$(MAKE) -C $(BASE)/cvm stage
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os.sms: $(TARGET) $(STAGE)
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dd if=$(TARGET) bs=32752 conv=sync | cat - sega.bin > $@
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os.sms: $(TARGET) $(STAGE) $(SMSROM)
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$(SMSROM) $(TARGET) > $@
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$(EMUL):
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$(MAKE) -C ${@:%/sms=%}
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Binary file not shown.
5
tools/.gitignore
vendored
5
tools/.gitignore
vendored
@ -1,13 +1,10 @@
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/memdump
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/blkdump
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/upload
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/fontcompile
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/ttysafe
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/pingpong
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/slatest
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/stripfc
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/bin2c
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/exec
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/blkpack
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/blkunpack
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/blkup
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/smsrom
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@ -6,9 +6,10 @@ EXEC_TGT = exec
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BLKPACK_TGT = blkpack
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BLKUNPACK_TGT = blkunpack
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BLKUP_TGT = blkup
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SMSROM_TGT = smsrom
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TARGETS = $(MEMDUMP_TGT) $(UPLOAD_TGT) \
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$(TTYSAFE_TGT) $(PINGPONG_TGT) $(EXEC_TGT) $(BLKPACK_TGT) \
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$(BLKUNPACK_TGT) $(BLKUP_TGT)
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$(BLKUNPACK_TGT) $(BLKUP_TGT) $(SMSROM_TGT)
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OBJS = common.o
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all: $(TARGETS)
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@ -25,6 +26,7 @@ $(EXEC_TGT): $(EXEC_TGT).c
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$(BLKPACK_TGT): $(BLKPACK_TGT).c
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$(BLKUNPACK_TGT): $(BLKUNPACK_TGT).c
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$(BLKUP_TGT): $(BLKUP_TGT).c
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$(SMSROM_TGT): $(SMSROM_TGT).c
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$(TARGETS): $(OBJS)
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$(CC) $(CFLAGS) $@.c $(OBJS) -o $@
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53
tools/smsrom.c
Normal file
53
tools/smsrom.c
Normal file
@ -0,0 +1,53 @@
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/* ./smsrom fname
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Transforms binary at fname into an 8K, 16K or 32K Sega Master System ROM with
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a header fit for an Export SMS. The resulting ROM is spit to stdout.
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Whether the ROM is 8, 16 or 32K depends on the size of binary at fname.
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*/
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#include <stdio.h>
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#include <inttypes.h>
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int main(int argc, char **argv)
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{
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if (argc != 2) {
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fprintf(stderr, "Usage: ./smsrom fname\n");
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return 1;
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}
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FILE *fp = fopen(argv[1], "r");
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if (!fp) {
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fprintf(stderr, "Can't open %s.\n", argv[1]);
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return 1;
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}
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fseek(fp, 0, SEEK_END);
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long fsize = ftell(fp);
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fseek(fp, 0, SEEK_SET);
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uint8_t hdsz = 0x4a; // size flag in header. either 4a, 4b or 4c.
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int romsize = 0x2000;
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while (romsize-16 < fsize) {
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romsize *= 2;
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hdsz++;
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if (romsize > 0x8000) {
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fprintf(stderr, "binary too big\n");
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return 1;
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}
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}
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uint16_t chksum = 0;
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for (int i=0; i<romsize-16; i++) {
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int c = getc(fp);
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if (c == EOF) c = 0;
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putchar(c);
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chksum += c;
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}
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// and now, the header
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printf("TMR SEGA");
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putchar(0);
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putchar(0);
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putchar(chksum & 0xff);
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putchar(chksum >> 8);
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putchar(0);
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putchar(0);
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putchar(0);
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putchar(hdsz);
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return 0;
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}
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