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Use random disk ID when formatting SD cards

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This fixes #972
This commit is contained in:
d0k3 2026-07-05 19:24:21 +02:00
parent a8df626a3d
commit fbce1fdb8e
1 changed files with 3 additions and 0 deletions
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3
arm9/source/filesys/fsutil.c
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@ -12,6 +12,7 @@
#include "ui.h"
#include "swkbd.h"
#include "language.h"
#include "timer.h"
#define SKIP_CUR (1UL<<11)
#define OVERWRITE_CUR (1UL<<12)
@ -39,6 +40,7 @@ bool FormatSDCard(u64 hidden_mb, u32 cluster_size, const char* label) {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x55, 0xAA
};
u32 disk_id = (u32) timer_start(); // free running HW timer, ticking since boot -> random enough
u32 sd_size = getMMCDevice(1)->total_size;
u32 emu_sector = 1;
u32 emu_size = (u32) ((hidden_mb * 1024 * 1024) / 512);
@ -62,6 +64,7 @@ bool FormatSDCard(u64 hidden_mb, u32 cluster_size, const char* label) {
memcpy(mbrdata + 0x0C, &fat_size, 4);
memcpy(mbrdata + 0x18, &emu_sector, 4);
memcpy(mbrdata + 0x1C, &emu_size, 4);
memcpy(mbr + 0x1B8, &disk_id, 4);
memcpy(mbr + 0x1BE, mbrdata, 0x42);
if (hidden_mb) memcpy(mbr, "GATEWAYNAND", 12); // legacy
else memset(mbr + 0x1CE, 0, 0x10);