Cisco Systems GRP-B manual Enabling Booting from Flash Memory, Router# squeeze slot0

Implementing Additional Configuration and Maintenance Tasks

You can delete a file from any Flash memory media using the delete filename command, where filename is any file within Flash memory. An example of deleting the file fun1 from the Flash memory card or Flash disk in slot 0 follows:

Router#		delete fun1
Router#		dir
-#- -length- -----date/time------ name
1	4601977		May	10	1997	09:42:19 myfile1
6	679		May	10	1997	05:43:56 todays–config

Files that are deleted are marked as deleted, but still occupy space in Flash memory. The command squeeze device-name(where device-namecan be slot0:, slot1:, or bootflash:) removes them permanently and pushes all other undeleted files together to eliminate spaces between them.

Note The squeeze command is used with Flash memory cards only. This command is not needed when using Flash disks.

An example of the squeeze command follows:

Router# squeeze slot0:

All deleted files will be removed, proceed? [confirm] Squeeze operation may take a while, proceed? [confirm] ebESZ

To prevent loss of data from sudden power loss, the “squeezed” data is temporarily saved to another location of Flash memory, which is specially used by the system.

The meanings of the characters in the preceding command display output as follows:

•e—This special location has been erased (which must occur before any write operation).

•b—The data that is about to be written to this special location has been temporarily copied.

•E—The sector that was temporarily occupied by the data was erased.

•S—The data was written to its permanent location in Flash memory.

•Z—This log was erased after the successful squeeze command operation.

The squeeze command operation keeps a log of which of these functions was performed, so that in case of sudden power failure, it can return to the correct place and continue with the process.

The configuration register setting 0x0101 tells the system to boot the default image (the first image) from onboard Flash memory, but not reset the Break disable or check for a default filename to be booted over the network. The configuration register setting 0x0102 tells the system to boot from Flash memory if netboot fails, then disable Break and check for a default netboot filename.

For more information on the copy tftp:filename [bootflash: slot0: slot1:]filename command and other related commands, refer to the set of configuration and reference publications.

Enabling Booting from Flash Memory

To enable booting from Flash memory, set configuration register bits 3, 2, 1, and 0 to a value between 2 and 15 in conjunction with the boot system flash device-name:filenameconfiguration command, where device-nameis bootflash:, slot0:, or slot1: (Flash memory cards), and bootflash:, disk0:, or disk 1:

(ATA Flash disk cards) and filename is the name of the file from which you want to boot the system.

To enter configuration mode while in the system software image and specify a Flash filename from which to boot, enter the configure terminal command at the enable prompt as follows:

Router#configure terminal

Flash Disks and Flash Memory Cards in the GRP

40 78-4339-09