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ããèææä»¶ç³»ç» æ件系ç»çå»ºç« ramfså åæä»¶ç³»ç» procæä»¶ç³»ç» devfs æä»¶ç³»ç» MTDææ¯ç®ä» MTDå设å¤åå§å
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mtd-utilså·¥å ·å¯¹mtdåmtdblockååºè®¾å¤çåºå«å¤ç
1 / $ flash_eraseall /dev/mtdblock/2
2 flash_eraseall: /dev/mtdblock/2: unable to get MTD device info
3 / $ flash_eraseall /dev/mtdblock/2
4 flash_eraseall: /dev/mtdblock/2: unable to get MTD device info
5 / $ flash_eraseall /dev/mtd/2
6 Erasing Kibyte @ 8e -- % complete.
7 / $ ls
1 / $ flashcp rootfs_version /dev/mtdblock2
2 This doesn't seem to be a valid MTD flash device!
3 / $ flashcp rootfs_version /dev/mtdblock/2
4 This doesn't seem to be a valid MTD flash device!
5 / $ flashcp rootfs_version /dev/mtd2
6 / $ ls
mtdåmtdblockååºè®¾å¤mountæ¶çåºå«
1 / $ mount -t jffs2 /dev/mtd/2 qqzm/
2 mount: Mounting /dev/mtd/2 on qqzm/ failed: Invalid argument
3 / $ mount -t jffs2 /dev/mtd2 qqzm/
4 mount: Mounting /dev/mtd2 on qqzm/ failed: Invalid argument
5 / $ mount -t jffs2 /dev/mtdblock/2 qqzm/
6 / $ ls
mtdblockæè½½æåï¼åæ¦é¤åå¸è½½å¤±è´¥
/ $ flash_eraseall /dev/mtd/2 <span></span> Erasing Kibyte @ 8e -- % complete.
/qqzm $ mount
/dev/root on / type jffs2 (rw,noatime)
proc on /proc type proc (rw,nodiratime)
sysfs on /sys type sysfs (rw)
devfs on /dev type devfs (rw)
devpts on /dev/pts type devpts (rw)
/dev/mmcblk0p1 on /mnt/sd type vfat (rw,nodiratime,fmask=,dmask=,codepage=cp,iocharset=iso-1)
/dev/mtdblock/2 on /qqzm type jffs2 (rw,noatime)
none on /qqzm/www/cgi-bin/tmp type ramfs (rw)
/qqzm $ cd ..
/ $ umount /qqzm
umount: Couldn't umount /qqzm: Inappropriate ioctl for device
/ $ umount /dev/mtdblock/2
umount: Couldn't umount /dev/mtdblock/2: Inappropriate ioctl for device
/ $
MTDææ¯çåºæ¬åç
MTD(memory technology deviceå åææ¯è®¾å¤)æ¯ç¨äºè®¿é®memory设å¤ï¼ROMãflashï¼çLinuxçåç³»ç»ãMTDç主è¦ç®çæ¯ä¸ºäºä½¿æ°çmemory设å¤ç驱å¨æ´å ç®åï¼ä¸ºæ¤å®å¨ç¡¬ä»¶åä¸å±ä¹é´æä¾äºä¸ä¸ªæ½è±¡çæ¥å£ï¼å¹¶è¿è¡äºä¸ä¸ªå±æ¬¡ååï¼å±æ¬¡ä»ä¸å°ä¸å¤§è´ä¸ºï¼è®¾å¤æ件ãMTD设å¤å±ãMTDåå§è®¾å¤å±ã硬件驱å¨å±ãMTDçæææºä»£ç å¨/drivers/mtdåç®å½ä¸ã
ç³»ç»ä¸çMTD设å¤æ件
~ $ ls /dev/mtd* -l
crw-rw---- 1 root root , 0 Jan 1 : /dev/mtd0
crw-rw---- 1 root root , 1 Jan 1 : /dev/mtd0ro
crw-rw---- 1 root root , 2 Jan 1 : /dev/mtd1
crw-rw---- 1 root root , 3 Jan 1 : /dev/mtd1ro
crw-rw---- 1 root root , 4 Jan 1 : /dev/mtd2
crw-rw---- 1 root root , 5 Jan 1 : /dev/mtd2ro
crw-rw---- 1 root root , 6 Jan 1 : /dev/mtd3
crw-rw---- 1 root root , 7 Jan 1 : /dev/mtd3ro
brw-rw---- 1 root root , 0 Jan 1 : /dev/mtdblock0
brw-rw---- 1 root root , 1 Jan 1 : /dev/mtdblock1
brw-rw---- 1 root root , 2 Jan 1 : /dev/mtdblock2
brw-rw---- 1 root root , 3 Jan 1 : /dev/mtdblock3
/dev/mtd:
crw-rw-rw- 1 root root , 0 Jan 1 : 0
cr--r--r-- 1 root root , 1 Jan 1 : 0ro
crw-rw-rw- 1 root root , 2 Jan 1 : 1
cr--r--r-- 1 root root , 3 Jan 1 : 1ro
crw-rw-rw- 1 root root , 4 Jan 1 : 2
cr--r--r-- 1 root root , 5 Jan 1 : 2ro
crw-rw-rw- 1 root root , 6 Jan 1 : 3
cr--r--r-- 1 root root , 7 Jan 1 : 3ro
/dev/mtdblock:
brw------- 1 root root , 0 Jan 1 : 0
brw------- 1 root root , 1 Jan 1 : 1
brw------- 1 root root , 2 Jan 1 : 2
brw------- 1 root root , 3 Jan 1 : 3
~ $
å¯ä»¥çå°æmtdNå对åºç/dev/mtd/NãmtdblockNå对åºç/dev/mtdblock/N两类MTD设å¤ï¼åå«æ¯å符设å¤ï¼ä¸»è®¾å¤å·åå设å¤ï¼ä¸»è®¾å¤å·ãå ¶ä¸/dev/mtd0å/dev/mtd/0æ¯å®å ¨çä»·çï¼/dev/mtdblock0å/dev/mtdblock/0æ¯å®å ¨çä»·çï¼è/dev/mtd0å/dev/mtdblock0åæ¯åä¸ä¸ªMTDååºç两ç§ä¸ååºç¨æè¿°ï¼æä½ä¸æ¯æåºå«çã
/dev/mtdN设å¤
/dev/mtdN æ¯MTDæ¶æä¸å®ç°çmtdååºæ对åºçå符设å¤(å°mtd设å¤åæå¤ä¸ªåºï¼æ¯ä¸ªåºå°±ä¸ºä¸ä¸ªå符设å¤)ï¼å ¶éé¢æ·»å äºä¸äºioctlï¼æ¯æå¾å¤å½ä»¤ï¼å¦MEMGETINFOï¼MEMERASEçã
mtd-utilsä¸çflash_eraseallçå·¥å ·ï¼å°±æ¯ä»¥è¿äºioctl为åºç¡èå®ç°çå·¥å ·ï¼å®ç°ä¸äºå ³äºFlashçæä½ãæ¯å¦ï¼mtd å·¥å ·ä¸ flash_eraseallä¸ï¼
1 if (ioctl(fd, MEMGETINFO, &meminfo) != 0)
2 {
3 fprintf(stderr, "%s: %s: unable to get MTD device info\n",exe_name, mtd_device);
4 return 1;
5 }
MEMGETINFOæ¯Linux MTDä¸çdrivers/mtd/mtdchar.cä¸çioctlå½ä»¤ï¼ä½¿ç¨mtdå符设å¤éè¦å è½½mtdcharå æ ¸æ¨¡åã该代ç 解éäºä¸é¢ç第ä¸ä¸ªç°è±¡ã
/dev/mtdblockN设å¤
/dev/mtdblockNï¼æ¯Flash驱å¨ä¸ç¨add_mtd_partitions()æ·»å MTD设å¤ååºï¼èçæç对åºçå设å¤ãMTDå设å¤é©±å¨ç¨åºå¯ä»¥è®©flashå¨ä»¶ä¼ªè£ æå设å¤ï¼å®é ä¸å®éè¿ææ´åçerase blockæ¾å°raméé¢è¿è¡è®¿é®ï¼ç¶ååæ´æ°å°flashï¼ç¨æ·å¯ä»¥å¨è¿ä¸ªå设å¤ä¸å建é常çæ件系ç»ã
è对äºMTDå设å¤ï¼MTD设å¤å±æ¯ä¸æä¾ioctlçå®ç°æ¹æ³çï¼ä¹å°±ä¸ä¼æ对åºçMEMGETINFOå½ä»¤ä¹ç±»ï¼å æ¤ä¸è½ä½¿ç¨nandwrite,flash_eraseall,flash_eraseçå·¥å ·å»å¯¹/dev/mtdblockNå»è¿è¡æä½ï¼å¦åå°±ä¼åºç°ä¸é¢çç°è±¡ä¸ï¼åæ¶ä¹è§£éäºç°è±¡3ââç¨mtd2æ¦é¤ååºåï¼å¨ç¨mtdblock2è¿è¡umountå°±ä¼é ææ··ä¹±ã
mtdå设å¤ç大å°å¯ä»¥éè¿procæ件系ç»è¿è¡æ¥çï¼
~ $ cat /proc/partitions
major minor #blocks name
0 mtdblock0
1 mtdblock1
2 mtdblock2
3 mtdblock3
0 mmcblk0
1 mmcblk0p1
~ $
åé¢ç两个æ¯SDå设å¤çååºå¤§å°ãæ¯ä¸ªblockç大å°æ¯1KBã
MTD设å¤ååºåæ»ç»
éè¿procæ件系ç»æ¥çmtd设å¤çååºæ åµï¼
1 ~ $ cat /proc/mtd
2 dev: size erasesize name
3 mtd0: "boot"
4 mtd1: "kernel"
5 mtd2: "roofs"
6 mtd3: "app"
7 ~ $
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è¿é对äºmtdåmtdblock设å¤ç使ç¨åºæ¯è¿è¡ç®åæ»ç»ï¼
mtd-utilså·¥å ·åªè½åºç¨ä¸/dev/mtdNçMTDå符设å¤
mountãumountå½ä»¤åªå¯¹/dev/mtdblockNçMTDå设å¤ææ
/dev/mtdNå/dev/mtdblockNæ¯åä¸ä¸ªMTD设å¤çåä¸ä¸ªååºï¼Nä¸æ ·ï¼