Cirrus Logic EDB9302A Bedienungsanleitung PDF herunterladen (Seite 17)

Loading the New Ramdisk File to the GESBC-9302

Now the last steps are in sight. All we need to do is load the new ramdisk file up

to the GESBC-9302 dynamic ram, then write it to flash memory. For this we will

use Redboot commands and the tftp server.

Getting into the Redboot Command Line

As before, we start Hyper-Terminal on the Windows PC and power up the

GESBC-9302. Just as a precaution, I start the “Capture Text” option to have a

record in case anything goes wrong. After powering-up the GESBC-9302,

Press ^C (Control C) to interrupt the normal bootup process so the system will

be in the Redboot command line mode.

Next we launch the tftp server on the Windows PC from the desktop icon. Don’t

forget to actually start the server from the Tftpd drop-down selection. Tftp will

display “Server is running. 0 out of max 32 clients are connected” along the

bottom of the window.

To upload the ramdisk file, we enter the load command into Redboot on the

GESBC-9302 from Hyper-Terminal:

load –v –r –b 0x800000 –h 192.168.0.128 ramdisk.gz

The –h option tells Redboot that there is a tftp server at IP address

192.168.0.128 (the Windows PC address on the LAN).

During the upload process the cursor in Hyper-Terminal will rotate. At the end of

the upload process a message is displayed:

Raw File loaded 0x00800000-0x009aa234, assumed entry at 0x00800000

This indicates that the ramdisk file is now residing in the GESBC-9302 dynamic

ram and occupies memory (hex) addresses 0x800000 through 0x9aa234.

Calculating the size of the Uploaded File

In order to write the file to flash, the size of the file needs to be calculated from

the address information shown by Redboot when it loads the file into RAM. To

do this, simply subtract the ending address from the starting address, in

hexdecimal notation.

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Cirrus Logic EDB9302A Bedienungsanleitung Seite 17