UM0844 datasheet(13/43 Pages) STMICROELECTRONICS

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UM0844

The pre-flashed software

Doc ID 16544 Rev 3

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In practice, the proc file system is intended to be populated at runtime with system

information and statistics. Proc files may be either read-only or read-write. Each numerically

named directory within /proc corresponds to the process ID (PID) of a process currently

executing on the system. This part of the proc filesystem totally depends on the runtime

state of the target. Each numeric entry contains subfiles that provide process-specific

information. The other (non-numeric) entries describe some aspects of kernel operation.

Some of the common user commands performed on the proc filesystem are:

# cat /proc/version

Displays full Linux kernel version information

# cat /proc/sys/kernel/osreleaseDisplays Linux kernel release

# cat /proc/sys/kernel/version

Displays Linux kernel build date and time

# cat /proc/cpuinfo

Displays information about the SPEAr CPU

# cat /proc/meminfo

Displays information about memory usage

# cat /proc/modules

Displays information about kernel extension modules

# cat /proc/mtd

Displays information about Flash partitions

# cat /proc/partitions

Displays other information about Flash partitions

# cat /proc/stat

Displays OS status information

# cat /proc/bus/usb/devices

Displays information about USB Host ports

# cat /proc/net/dev

Reports Ethernet information.

# cat /proc/net/tcp

Reports TCP sockets information.

# cat /proc/net/udp

Reports UDP sockets information.

# cat /proc/net/arp

Reports ARP table.

# cat /proc/net/route

Reports IP routing table.

# cat /proc/kallsyms

Lists all kernel symbols

The standard /proc/bus/usb subtree is also made available. This is used to access USB

Host controllers and plugged devices from user-space applications.

For more details about the functionality provided by pseudo filesystems, please refer to

standard Linux documentation.

2.4

Using a USB pendrive

USB pendrives can be accessed in a standard Linux way, connecting them to a USB host

port and mounting their filesystem under root filesystem. An example of operational

sequence for a standard pendrive connected as "sda" device (only one pendrive present) is

the following:

Plug the pendrive in a USB port. and wait for the Linux kernel to autodetect it (you can

see active kernel messages on the terminal)

Mount the pendrive filesystem:

# mount /dev/sda1 /mnt

Now the pendrive filesystem can be accessed under /mnt directory.

Transfer files as usual (for example, cp command).

When finished, unmount the pendrive:

# umount /mnt

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