Cirrus Logic EDB9302A Bedienungsanleitung PDF herunterladen (Seite 20)

Conclusions

The method shown here is the classic way to customize an embedded Linux

system: change files and add programs to the file system, test via NFS and then

burn the new file system image to the GESBC-9302 flash. The result is that the

GESBC-9302 is self-contained and fast in execution because everything is

running in a ramdisk.

There are however, some limitations with this method. Because the file system

is running in a ramdisk, there will be a limit to how much can be added. Using

the df command shows that the ramdisk is 65% used after the new file system

was installed into the GESBC-9302. There are still 2.116 Mbytes available, but

any additions to this file system will have an upper limit. In order to add a new

package or expand the file system image greatly would require a recompile of the

kernel so that a larger ramdisk could be launched at bootup.

You could have Redboot mount the file system directly from the USB drive

instead of a ramdisk and trade some speed for added memory and flexibility.

And you could even set the GESBC-9302 to find its file system via NFS on

power-up.

The Redboot loader has a scripting capability that allows the user to specify

loading the file system from any number of places. Read the Redboot command

documentation at www.ecoscentric.com for a complete description of the

Redboot capabilities.

Keep in mind that the GESBC-9302 comes with Linux in the default configuration

described in this article. The GESBC-9302 can also run other operating systems

including: eCos, NetBSD, Inferno, Win CE and others.

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Cirrus Logic EDB9302A Bedienungsanleitung Seite 20