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@@ -14,18 +14,57 @@ using 0xf8 media descriptor, with 8192 sectors;
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file system has 2 32-bit FATs and 1 sector per cluster.
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FAT size is 63 sectors, and provides 8034 clusters.
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Volume ID is 4a1424ec, no volume label.
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+
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+filesize 4194304
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+
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*/
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+/* Interface
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+
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+** Scratch Buffer
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+
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+addr 3 byte
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+size 1 byte
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+
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+** Call Interface
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+
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+cmd 1 byte
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+sector 4 bytes
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+count 1 byte
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+return 1 byte
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+
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+** Commands
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+
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+ * disk_init
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+ * disk_read
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+ * disk_write
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+
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+
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+*/
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+
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/*-----------------------------------------------------------------------*/
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/* Initialize Disk Drive */
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/*-----------------------------------------------------------------------*/
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+#define IMAGE_NAME "disk00.vfat"
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+
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+int image_addr;
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+
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DSTATUS disk_initialize (BYTE drv) {
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if (drv) return STA_NOINIT; /* Supports only single drive */
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Stat |= STA_NOINIT;
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/* map image */
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+
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+
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+ int fd = open(IMAGE_NAME,);
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+ int size = fseek(END);
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+ fseek(0);
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+
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+ image_addr = mmap(0,fd,)
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+
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+
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Stat &= ~STA_NOINIT; /* When device goes ready, clear STA_NOINIT */
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return Stat;
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}
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@@ -55,7 +94,15 @@ DRESULT disk_read (
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BYTE c, iord_l, iord_h;
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if (drv || !count) return RES_PARERR;
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if (Stat & STA_NOINIT) return RES_NOTRDY;
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-
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+
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+ printf("disk_read: sector=%i count=%i\n",sector,count);
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+
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+ DWORD offset = sector * 512;
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+ DWORD size = count * 512;
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+
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+ printf("disk_read: addr=%p offset=%i size=%i\n",image_addr,offset,size);
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+ memcpy(buff,image_addr + offset,size);
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+
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/* Issue Read Setor(s) command */
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/*
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write_ata(REG_COUNT, count);
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@@ -82,7 +129,8 @@ DRESULT disk_write (
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)
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{
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BYTE s, c, iowr_l, iowr_h;
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-
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+
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+
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if (drv || !count) return RES_PARERR;
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if (Stat & STA_NOINIT) return RES_NOTRDY;
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@@ -120,29 +168,36 @@ DRESULT disk_ioctl (
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switch (ctrl) {
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case GET_SECTOR_COUNT : /* Get number of sectors on the disk (DWORD) */
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+ printf("disk_ioctl: GET_SECTOR_COUNT\n");
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ofs = 60; w = 2; n = 0;
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break;
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case GET_SECTOR_SIZE : /* Get sectors on the disk (WORD) */
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+ printf("disk_ioctl: GET_SECTOR_SIZE\n");
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*(WORD*)buff = 512;
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return RES_OK;
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case GET_BLOCK_SIZE : /* Get erase block size in sectors (DWORD) */
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+ printf("disk_ioctl: GET_BLOCK_SIZE\n");
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*(DWORD*)buff = 32;
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return RES_OK;
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case CTRL_SYNC : /* Nothing to do */
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+ printf("disk_ioctl: CTRL_SIZE\n");
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return RES_OK;
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case ATA_GET_REV : /* Get firmware revision (8 chars) */
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+ printf("disk_ioctl: ATAL_GET_REV\n");
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ofs = 23; w = 4; n = 4;
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break;
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case ATA_GET_MODEL : /* Get model name (40 chars) */
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+ printf("disk_ioctl: ATAL_GET_MODEL\n");
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ofs = 27; w = 20; n = 20;
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break;
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case ATA_GET_SN : /* Get serial number (20 chars) */
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+ printf("disk_ioctl: ATAL_GET_SN\n");
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ofs = 10; w = 10; n = 10;
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break;
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