>From eMMC spec 4.3, eMMC will have 2 boot partition called boot partitions , and general partition called user partition For robust disign , Boot partition will not be able to use wear leave . so it should be use as SLC design (against user partition MLC )and make a backup And on Ti chip , these 2 partition CAN NOT used as boot partition , while in FSL and QUANTUM , their boot rom can boot from these 2 (only depend on the boot flag in extCSD[179])
You can read the imx 6 Reference manual for more detail about this . 2014-05-29 11:28 GMT+08:00 jiapei100 <[email protected]>: > > Hi, all: > > > Sorry for dropping this stupid question. But, with my TF card plugged in, > I checked the memory of BBB (Refer to the bottom command) > It looks BBB's memory is quite messy. > > On my 32Giga TF Card, namely, mmcblk0, I got /dev/mmcblk0p1 and > /dev/mmcblk0p2 > On eMMC, namely, /dev/mmcblk1, I got dev/mmcblk0p1, dev/mmcblk0p2, > /dev/mmcblk1boot0, and /dev/mmcblk1boot1 . > > Just wondering, why on eMMC, there are /dev/mmcblk1boot0, and > /dev/mmcblk1boot1? What for? > And, it looks that my eMMC is only of 2Giga? I was thinking the newest BBB > is of 4Giga eMMC??? > > > Cheers > Pei > > > > 1) *debian@beaglebone:~/Downloads/installed/kernel$ ls -ls /dev/mmcblk** > 0 brw-rw---T 1 root floppy 179, 0 Apr 15 00:17 /dev/mmcblk0 > 0 brw-rw---T 1 root floppy 179, 1 Apr 15 00:17 /dev/mmcblk0p1 > 0 brw-rw---T 1 root floppy 179, 2 Apr 15 00:17 /dev/mmcblk0p2 > 0 brw-rw---T 1 root floppy 179, 8 Apr 15 00:18 /dev/mmcblk1 > 0 brw-rw---T 1 root floppy 179, 16 Apr 15 00:17 /dev/mmcblk1boot0 > 0 brw-rw---T 1 root floppy 179, 24 Apr 15 00:17 /dev/mmcblk1boot1 > 0 brw-rw---T 1 root floppy 179, 9 Apr 15 00:18 /dev/mmcblk1p1 > 0 brw-rw---T 1 root floppy 179, 10 May 29 02:16 /dev/mmcblk1p2 > > 2) *debian@beaglebone:~/Downloads/installed/kernel$ fdisk -ls* > > Disk /dev/mmcblk0: 31.5 GB, 31486640128 bytes > 4 heads, 16 sectors/track, 960896 cylinders, total 61497344 sectors > Units = sectors of 1 * 512 = 512 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x000a9bd0 > > Device Boot Start End Blocks Id System > /dev/mmcblk0p1 * 2048 198655 98304 e W95 FAT16 > (LBA) > /dev/mmcblk0p2 198656 61497343 30649344 83 Linux > > Disk /dev/mmcblk1: 1920 MB, 1920991232 bytes > 4 heads, 16 sectors/track, 58624 cylinders, total 3751936 sectors > Units = sectors of 1 * 512 = 512 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x00000000 > > Device Boot Start End Blocks Id System > /dev/mmcblk1p1 * 2048 198655 98304 e W95 FAT16 > (LBA) > /dev/mmcblk1p2 198656 3751935 1776640 83 Linux > > *Disk /dev/mmcblk1boot1: 1 MB, 1048576 bytes* > 4 heads, 16 sectors/track, 32 cylinders, total 2048 sectors > Units = sectors of 1 * 512 = 512 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x00000000 > > *Disk /dev/mmcblk1boot1 doesn't contain a valid partition table* > > *Disk /dev/mmcblk1boot0: 1 MB, 1048576 bytes* > 4 heads, 16 sectors/track, 32 cylinders, total 2048 sectors > Units = sectors of 1 * 512 = 512 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x00000000 > > *Disk /dev/mmcblk1boot0 doesn't contain a valid partition table* > > > > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
