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booter_fc: work around the R4i-SDHC protection scheme (#1961)
One of many of Taiju Yamada (nee Xenon++)'s tools included a small patcher to work around the protection within the R4i-SDHC firmware. As a result of this patcher, the entry address had to be changed to 0x02000450. Fortunately, our Acekard 2 booter uses a 0x02000450 entry address, so it is reused here.
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...dvance, R4-IIIi, R4 SDHC Revolution, R4(i) Pocket, R4i Gold (v1.4.1) (3DS) & R4xDS/R4.DAT
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| // This file is licensed CC0-1.0 by Taiju Yamada. | ||
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| #include <stdio.h> | ||
| #include <string.h> | ||
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| // arbitrary number. Don't know if this can be changed, because other converters of this type uses this value too... -lifehackerhansol | ||
| #define S 433264 | ||
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| #define BUFLEN (1<<19) | ||
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| int main(int argc, char **argv) { | ||
| int size = S - 0x450, u; | ||
| if(argc < 3) { | ||
| fprintf(stderr, "r4isdhc in out\n"); | ||
| return 1; | ||
| } | ||
| FILE* in = fopen(argv[1], "rb"); | ||
| if(!in) { | ||
| fprintf(stderr, "cannot open\n"); | ||
| return 2; | ||
| } | ||
| FILE* out = fopen(argv[2], "wb"); | ||
| if(!out) { | ||
| fclose(in); | ||
| fprintf(stderr, "cannot open\n"); | ||
| return 3; | ||
| } | ||
| unsigned char buf[BUFLEN]; | ||
| memset(buf, 0, 0x450); | ||
| buf[0] = 0x12, buf[1] = 0x01, buf[2] = 0x00, buf[3] = 0xea; | ||
| buf[0xec] = 0x49, buf[0xed] = 0x00, buf[0xee] = 0x00, buf[0xef] = 0xeb; | ||
| fwrite(buf, 1, 0x450, out); | ||
| while(u = fread(buf, 1, BUFLEN, in)) fwrite(buf, 1, u, out), size-=u; | ||
| fclose(in); | ||
| memset(buf, 0, BUFLEN); | ||
| while(size > 0) fwrite(buf, 1, size < BUFLEN ? size : BUFLEN, out), size -= BUFLEN; | ||
| fclose(out); | ||
| return 0; | ||
| } |