TS-4720 eMMC: Difference between revisions
(Added reference to new image motif for eMMC.) |
No edit summary |
||
| (One intermediate revision by one other user not shown) | |||
| Line 1: | Line 1: | ||
This board includes an onboard 4GB eMMC disk. | This board includes an onboard 4GB eMMC disk. This disk is accessed very similar to an SD card and is also supported with the sdctl driver. This eMMC supports read and write speeds at approximately 10MB/s. The kernel provides access to the flash at /dev/nbd1 for the entire block device. The kernel also includes a module that will break this up into partitions. Our default software image contains 2 partitions: | ||
{|class=wikitable | {|class=wikitable | ||
| Line 32: | Line 32: | ||
<source lang=bash> | <source lang=bash> | ||
# excpecting "source ts.subr" is already done | # excpecting "source ts.subr" is already done | ||
scan_lun | scan_lun <lun number> | ||
mkdir /dev/sd | mkdir /dev/sd | ||
mount /dev/nbd1p2 /mnt/sd | mount /dev/nbd1p2 /mnt/sd | ||
</source> | </source> | ||
Latest revision as of 11:28, 11 January 2021
This board includes an onboard 4GB eMMC disk. This disk is accessed very similar to an SD card and is also supported with the sdctl driver. This eMMC supports read and write speeds at approximately 10MB/s. The kernel provides access to the flash at /dev/nbd1 for the entire block device. The kernel also includes a module that will break this up into partitions. Our default software image contains 2 partitions:
| Device | Contents |
|---|---|
| /dev/nbd1 | eMMC block device |
| /dev/nbd1p1 | Kernel and initramfs |
| /dev/nbd1p2 | Full Linux Root |
Pre 11/2/2014 release TS-4720 eMMC by default uses Single card doublestore. To access the Linux partition of the SD card while booted to eMMC, you can use the mount command as expected:
mkdir /mnt/sd
mount /dev/nbd1p2 /mnt/sd
Post 11/2/2014 release TS-4720 eMMC uses Enhanced SLC mode eMMC, allowing for even greater reliability and longer lifespan. To access the Linux partition of the SD Card while using this eMMC, read the device partition table, and then mount as normal:
busybox blockdev --rereadpt /dev/nbd1
mkdir /mnt/sd
mount /dev/nbd1p2 /mnt/sd
A useful script for this device read activity has been included in the ts.subr definitions file for use within custom startup scripts:
# excpecting "source ts.subr" is already done
scan_lun <lun number>
mkdir /dev/sd
mount /dev/nbd1p2 /mnt/sd