jalr/rpi-pico-usb-ramdisk
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Fix partition table

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This commit is contained in:
Jakob Lechner 2025-04-03 01:01:49 +02:00
parent b7209dd331
commit a9db8eeb4f
1 changed files with 15 additions and 14 deletions
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27
src/main.rs
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@ -133,10 +133,10 @@ fn main() -> ! {
const OEM: [u8; 8] = *b"mkfs.fat";
const FILESYSTEM_ID: [u8; 4] = [0xDE, 0xAD, 0xBE, 0xEF];
const FILESYSTEM_NAME: [u8; 11] = *b"RAM_USB\0\0\0\0";
const FILESYSTEM_LABEL: [u8; 11] = *b"RAM_USB ";
storage[0x1B8..0x1BC].copy_from_slice(&[0xEF, 0xBE, 0xAD, 0xDE]);
storage[0x1BE..0x1C3].copy_from_slice(&[0x00, 0x00, 0x02, 0x00, 0x01]);
storage[0x1B9] = 0x10;
storage[0x1BE..0x1C3].copy_from_slice(&[0x00, 0x00, 0x02, 0x00, 0x0c]);
storage[0x1C3] = last_head as u8;
storage[0x1C4] = ((last_cyl >> 8) & 0xc0) as u8 | ((last_sect as u8) & 0x3f);
storage[0x1C5] = last_cyl as u8;
@ -150,22 +150,23 @@ fn main() -> ! {
// FAT12 Partition
storage[0x200..0x203].copy_from_slice(&[0xEB, 0x3C, 0x90]);
storage[0x203..0x20B].copy_from_slice(&OEM);
storage[0x20B..0x227].copy_from_slice(&[0x00, 0x02, 0x04, 0x01, 0x00,
0x02, 0x00, 0x02, (DISK_BLOCK_NUM & 0xff) as u8,
(DISK_BLOCK_NUM >> 8) as u8,
0xF8, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x29]);
storage[0x20B..0x21d].copy_from_slice(&[0x00, 0x02, 0x04, 0x01, 0x00,
0x02, 0x00, 0x02, (LBA & 0xff) as u8,
(LBA >> 8) as u8,
0xF8, 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, 0x01]);
storage[0x224..0x227].copy_from_slice(&[0x80, 0x00, 0x29]);
storage[0x227..0x22B].copy_from_slice(&FILESYSTEM_ID);
storage[0x22B..0x236].copy_from_slice(&FILESYSTEM_NAME);
storage[0x22B..0x236].copy_from_slice(&FILESYSTEM_LABEL);
storage[0x236..0x23E].copy_from_slice(b"FAT12 ");
storage[0x3FE..0x400].copy_from_slice(&[0x55, 0xAA]);
storage[0x400..0x403].copy_from_slice(&[0xF8, 0xFF, 0xFF]);
storage[0x600..0x603].copy_from_slice(&[0xF8, 0xFF, 0xFF]);
storage[0x800..0x80B].copy_from_slice(&FILESYSTEM_NAME);
storage[0x80B..0x81A].copy_from_slice(&[0x08, 0x00, 0x00, 0xF9, 0x98,
0x3A, 0x58, 0x3A, 0x58, 0x00, 0x00, 0xF9, 0x98, 0x3A, 0x58
]);
storage[0x800..0x80B].copy_from_slice(&FILESYSTEM_LABEL);
storage[0x80B] = 0x08; // file attribute 0x08 = volume label
// https://de.wikipedia.org/wiki/File_Allocation_Table
// Remove bootloader code: dd if=/dev/zero conv=notrunc of=foo bs=1 count=420 seek=602
let mut state: State = State {
storage_offset: 0,