U-BOOT介紹以及disk子產品源碼分析（下）

Part_dos.c 檔案：

……

static void print_one_part (dos_partition_t *p, int ext_part_sector, int part_num)

{ //列印一個分區資訊

……

printf ("%5d/t/t%10d/t%10d/t%2x%s/n",

part_num, lba_start, lba_size, p->sys_ind,

(is_extended (p->sys_ind) ? " Extd" : ""));

}

static int test_block_type(unsigned char *buffer)

{ //測試塊類型

if((buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||

(buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {

return (-1);

} //不是dos塊

if(strncmp(&buffer[DOS_PBR_FSTYPE_OFFSET],"FAT",3)==0)

return DOS_PBR;

return DOS_MBR;

}

int test_part_dos (block_dev_desc_t *dev_desc)

{ //測試是否為dos塊

unsigned char buffer[DEFAULT_SECTOR_SIZE];

if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) buffer) != 1) ||

(buffer[DOS_PART_MAGIC_OFFSET + 0] != 0x55) ||

(buffer[DOS_PART_MAGIC_OFFSET + 1] != 0xaa) ) {

return (-1);

}

return (0);

}

static void print_partition_extended (block_dev_desc_t *dev_desc, int ext_part_sector, int relative, int part_num)

{ //輸出與其擴充分區表有關的分區資訊

……

//輸出所有主要/邏輯分區

pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);

for (i = 0; i < 4; i++, pt++) {//檔案系統不顯示MBR以外的分區

if ((pt->sys_ind != 0) &&

(ext_part_sector == 0 || !is_extended (pt->sys_ind)) ) {

print_one_part (pt, ext_part_sector, part_num);

}

if ((ext_part_sector == 0) ||

(pt->sys_ind != 0 && !is_extended (pt->sys_ind)) ) {

part_num++;

}

//處理擴充分區

pt = (dos_partition_t *) (buffer + DOS_PART_TBL_OFFSET);

for (i = 0; i < 4; i++, pt++) {

if (is_extended (pt->sys_ind)) {

int lba_start = le32_to_int (pt->start4) + relative;

print_partition_extended (dev_desc, lba_start,

ext_part_sector == 0 ? lba_start

: relative,

part_num);

}

return;

}

static int get_partition_info_extended (block_dev_desc_t *dev_desc, int ext_part_sector, int relative, int part_num, int which_part, disk_partition_t *info)

{ //擷取與其擴充分區表有關的分區資訊

……

}

……

Part_iso.c 檔案：

int get_partition_info_iso_verb(block_dev_desc_t * dev_desc, int part_num, disk_partition_t * info, int verb)

{ //獲得iso裝置塊的分區資訊

……

//第一部分必須是主要卷

blkaddr=PVD_OFFSET;

if (dev_desc->block_read (dev_desc->dev, PVD_OFFSET, 1, (ulong *) tmpbuf) != 1)

return (-1);

if(ppr->desctype!=0x01) {

if(verb)

printf ("** First descriptor is NOT a primary desc on %d:%d **/n",

dev_desc->dev, part_num);

return (-1);

}

if(strncmp(ppr->stand_ident,"CD001",5)!=0) {

if(verb)

printf ("** Wrong ISO Ident: %s on %d:%d **/n",

ppr->stand_ident,dev_desc->dev, part_num);

return (-1);

}

……

//尋找入口

if(strncmp(pbr->ident_str,"EL TORITO SPECIFICATION",23)!=0) {

if(verb)

printf ("** Wrong El Torito ident: %s on %d:%d **/n",

pbr->ident_str,dev_desc->dev, part_num);

return (-1);

}

bootaddr=le32_to_int(pbr->pointer);

PRINTF(" Boot Entry at: %08lX/n",bootaddr);

if (dev_desc->block_read (dev_desc->dev, bootaddr, 1, (ulong *) tmpbuf) != 1) {

if(verb)

printf ("** Can't read Boot Entry at %lX on %d:%d **/n",

bootaddr,dev_desc->dev, part_num);

return (-1);

}

……

//找到有效入口，現在尋找分區

entry_num=0;

offset=0x20;

sprintf (info->type, "U-Boot");

switch(dev_desc->if_type) {

case IF_TYPE_IDE:

case IF_TYPE_ATAPI:

sprintf (info->name, "hd%c%d/n", 'a' + dev_desc->dev, part_num);

break;

……

default:

sprintf (info->name, "xx%c%d/n", 'a' + dev_desc->dev, part_num);

break;

}

//bootcatalog (including validation Entry) 必須小于 2048Bytes

while(offset<2048) {

pide=(iso_init_def_entry_t *)&tmpbuf[offset];

if ((pide->boot_ind==0x88) ||

(pide->boot_ind==0x00)) { //預設入口的id頭

if(entry_num==part_num) { //找到分區

goto found;

}

entry_num++; //記錄分區入口數

offset+=0x20;

continue;

}

if ((pide->boot_ind==0x90) ||

(pide->boot_ind==0x91) ||

(pide->boot_ind==0x44)) {

offset+=0x20; //跳過不使用的入口

}

else {

if(verb)

printf ("** Partition %d not found on device %d **/n",

part_num,dev_desc->dev);

return(-1);

}

……

newblkaddr=le32_to_int(pide->rel_block_addr);

info->start=newblkaddr;

PRINTF(" part %d found @ %lx size %lx/n",part_num,newblkaddr,info->size);

return 0;

}

int get_partition_info_iso(block_dev_desc_t * dev_desc, int part_num, disk_partition_t * info)

{

return(get_partition_info_iso_verb(dev_desc, part_num, info, 1));

}

void print_part_iso(block_dev_desc_t * dev_desc)

{ //列印分區資訊

disk_partition_t info;

int i;

if(get_partition_info_iso_verb(dev_desc,0,&info,0)==-1) {

printf("** No boot partition found on device %d **/n",dev_desc->dev);

return;

}

printf("Part Start Sect x Size Type/n");

i=0;

do {

printf (" %2d %8ld %8ld %6ld %.32s/n",

i, info.start, info.size, info.blksz, info.type);

i++;

} while (get_partition_info_iso_verb(dev_desc,i,&info,0)!=-1);

}

int test_part_iso (block_dev_desc_t *dev_desc)

{ 測試是否為iso分區

disk_partition_t info;

return(get_partition_info_iso_verb(dev_desc,0,&info,0));

}

Part_mac.c 檔案：

int test_part_mac (block_dev_desc_t *dev_desc)

{ //檢查是否為有效的mac分區

……

if (part_mac_read_ddb (dev_desc, &ddesc)) {//讀塊錯誤，或無有效資訊

return (-1); }

n = 1; //假設最少有一個分區

for (i=1; i<=n; ++i) {

if ((dev_desc->block_read(dev_desc->dev, i, 1, (ulong *)&mpart) != 1) ||

(mpart.signature != MAC_PARTITION_MAGIC) ) {

return (-1);

}

n = mpart.map_count; 更新分區數

}

return (0);

}

void print_part_mac (block_dev_desc_t *dev_desc)

{ //輸出mac分區資訊

……

if (part_mac_read_ddb (dev_desc, &ddesc)) {

return;

}

n = ddesc.blk_count;

……

printf ("Block Size=%d, Number of Blocks=%d, "

"Total Capacity: %ld.%ld MB = %ld.%ld GB/n"

"DeviceType=0x%x, DeviceId=0x%x/n/n"

" #: type name"

" length base (size)/n",

ddesc.blk_size,

ddesc.blk_count,

mb.quot, mb.rem, gb.quot, gb.rem,

ddesc.dev_type, ddesc.dev_id

);

n = 1; //假設最少有一個分區

for (i=1; i<=n; ++i) {

……

printf ("%20.32s %-18.32s %10u @ %-10u (%3ld%c)/n",

mpart.type,

mpart.name,

mpart.block_count,

mpart.start_block,

bytes, c

);

}

return;

}

static int part_mac_read_ddb (block_dev_desc_t *dev_desc, mac_driver_desc_t *ddb_p)

{ //讀取裝置描述塊資訊

……

if (ddb_p->signature != MAC_DRIVER_MAGIC) {

#if 0

printf ("** Bad Signature: expected 0x%04x, got 0x%04x/n",

MAC_DRIVER_MAGIC, ddb_p->signature);

#endif

return (-1);

}

return (0);

}

static int part_mac_read_pdb (block_dev_desc_t *dev_desc, int part, mac_partition_t *pdb_p)

{ //讀取分區描述塊資訊

int n = 1;

for (;;) { //必須從第一個分區開始讀描述塊，隻有這樣才能知道一共有多少個分區

if (dev_desc->block_read (dev_desc->dev, n, 1, (ulong *)pdb_p) != 1) {

printf ("** Can't read Partition Map on %d:%d **/n",

dev_desc->dev, n);

return (-1);

}

if (pdb_p->signature != MAC_PARTITION_MAGIC) {

printf ("** Bad Signature on %d:%d: "

"expected 0x%04x, got 0x%04x/n",

dev_desc->dev, n, MAC_PARTITION_MAGIC, pdb_p->signature);

return (-1);

}

if (n == part)

return (0);

if ((part < 1) || (part > pdb_p->map_count)) {

printf ("** Invalid partition %d:%d [%d:1...%d:%d only]/n",

dev_desc->dev, part,

dev_desc->dev,

dev_desc->dev, pdb_p->map_count);

return (-1);

}

n = part; //更新分區數

}

int get_partition_info_mac (block_dev_desc_t *dev_desc, int part, disk_partition_t *info)

{ //擷取mac分區的資訊

mac_driver_desc_t ddesc;

mac_partition_t mpart;

if (part_mac_read_ddb (dev_desc, &ddesc)) {

return (-1);

}

info->blksz = ddesc.blk_size;

if (part_mac_read_pdb (dev_desc, part, &mpart)) {

return (-1);

}

info->start = mpart.start_block;

info->size = mpart.block_count;

memcpy (info->type, mpart.type, sizeof(info->type));

memcpy (info->name, mpart.name, sizeof(info->name));

return (0);

}

四．常用 U-BOOT 指令介紹

1.list 得到所有指令清單

2.help: help usb, 列出USB功能的使用說明

3.ping：注：隻能開發闆PING别的機器

4.setenv: 設定互環境變量:

5.setenv serverip 192.168.0.1

6.setenv ipaddr 192.168.0.56

7.setenv bootcmd ‘tftp 32000000 vmlinux; kgo 32000000 ’

8.saveenv: 儲存環境變量

9.在設定好環境變量以後，儲存變量值

10.tftp: tftp 32000000 vmlinux, 把server（IP=環境變量中設定的serverip）中/tftpdroot/ 下的vmlinux通過TFTP讀入到實體記憶體32000000處。

11.kgo: 起動沒有壓縮的linux核心，kgo 32000000

12.bootm:起動UBOOT TOOLS制作的壓縮LINUX核心, bootm 3200000

13.protect: 對FLASH進行寫保護或取消寫保護， protect on 1:0-3(就是對第一塊FLASH的0-3扇區進行保護)，protect off 1:0-3取消寫保護

14.erase: 删除FLASH的扇區， erase 1:0-2(就是對每一塊FLASH的0-2扇區進行删除)

15.cp: 在記憶體中複制内容， cp 32000000 0 40000(把記憶體中0x32000000開始的0x40000位元組複制到0x0處)

16.mw: 對RAM中的内容寫操作， mw 32000000 ff 10000(把記憶體0x32000000開始的0x10000位元組設為0xFF)

17.md: 修改RAM中的内容, md 32000000（記憶體的起始位址）

18.usb:

lusb start: 起動usb 功能

lusb info: 列出裝置

lusb scan: 掃描usb storage(u 盤)裝置

19.fatls：列出DOS FAT檔案系統，如：fatls usb 0列出第一塊U盤中的檔案

20.fatload: 讀入FAT中的一個檔案，如：fatload usb 0:0 32000000 aa.txt

21.把USB中的aa.txt 讀到實體記憶體0x32000000處！

22.flinfo: 列出flash的資訊

23.loadb: 準備用KERMIT協定接收來自kermit或超級終端傳送的檔案。

24.nfs： nfs 32000000 192.168.0.2:aa.txt ，把192.168.0.2(LINUX 的NFS檔案系統)中的NFS檔案系統中的aa.txt 讀入記憶體0x32000000處。

U-BOOT介紹以及disk子產品源碼分析（下）

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