XPRAM partitions and device nodes

The XPRAM device driver uses major number 35. The standard device names are of the form slram<n>, where <n> is the corresponding minor number.

You can use the entire available expanded storage as a single XPRAM device or divide it into up to 32 partitions. Each partition is treated as a separate XPRAM device.

If the entire expanded storage is used a single device, the device name is slram0. For partitioned expanded storage, the <n> in the device name denotes the (n+1)th partition. For example, the first partition is called slram0, the second slram1, and the 32nd partition is called slram31.

Table 1. XPRAM device names, minor numbers, and partitions
Minor	Name	To access
0	slram0	the first partition or the entire expanded storage if there are no partitions
1	slram1	the second partition
2	slram2	the third partition
... <n> ...	... slram<n> ...	... the (<n>+1)th partition ...
31	slram31	the 32nd partition

The device nodes that you need to access these partitions are created by udev when you load the XPRAM device driver module. The nodes are of the form /dev/slram<n>, where <n> is the index number of the partition. In addition, to the device nodes udev creates a symbolic link of the form /dev/xpram<n> that points to the respective device node.