Aml M7140 Stationary Terminal Manual de usuario descargar pdf (Pagina 51)

The RAM memory works much like a standard PC, The Linux operating system and any

programs currently being executed, are utilizing the RAM memory. Very large programs that

exceed the RAM memory storage size can not be executed on the M7140. Just like in a

standard PC, this RAM memory is lost when the unit is powered off. All permanent storage of

the operating system, programs and data must be done in the Flash memory.

Some of the Flash memory is used by the Linux operating system along with some associated

programs. On the expanded memory version of the M7140, there is a large percentage of

Flash memory available for user programs. These user programs are often added to the Linux

kernel and downloaded to the M7140 as one large memory block.

Sometimes the users will wish to add programs at a later date or store temporary data in the

Flash memory. The M7140 has a special sub-directory for all programs and data that are

temporary but must be saved even when the unit is turned off. This is the “Journaling Flash

File System” sub-directory also know as the “jffs2”.

The M7140 Standard Memory Map

Flash Memory

–

4 MB

RAM Memory

–

16 MB

64K Boot Loader

832K Linux ZImage

Compressed Kernel

64K

Splash Screen Bitmap

64K Boot Parameters

2.4MB rdisk.gz

Compressed Linux Applications

640K jffs2 – Non-volatile File System

7MB Uncompressed (running)

Linux Kernel

1MB Free User Memory (volatile)

6MB Uncompressed (running)

Linux Applications

Root File System

2MB Scratch Pad File System

Volatile File Memory Area

Free File Memory Area

Note: The jffs2 sub-directory is the only

memory location that user files can be

saved, that will not be lost when the

power is turned off.

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Aml M7140 Stationary Terminal Manual de usuario Pagina 51