When the system’s configuration file pica_startup.boot is damaged due to incorrect configuration, the system will fail to startup. PICA8 provides a feature of Graceful Bootup with Backup Configuration to solve this problem. It ensures the device boots up properly and with the backup configuration file pica.conf when startup configuration file pica_startup.boot is damaged due to incorrect configuration.

pica.conf is a backup of the pica_startup.boot file which is saved in directory /pica/config. When the user commits a configuration successfully, the system automatically saves the configuration to the pica_startup.boot file and synchronizes the configuration to the pica.conf file. In the event of an upgrade, the upgraded system will retain the previous pica_startup.boot, and the pica.conf file is a copy of pica_startup.boot file. But in the case of newly installed image, the system will not have the pica_startup.boot, and the pica.conf file is a copy of pica_default.boot file. The boot process is further explained below.

Process of Loading Configuration File

Figure 1 Process of loading configuration file when system rebooting

As shown in Figure 1, the process of loading configuration file when system rebooting is as follows:

1. The system starts loading the configuration file by parsing the pica_startup.boot file to the syntax.

If the result of the check is success, system will load pica_startup.boot file, go to step 2.
If the result of the check is fail, that is, the pica_startup.boot file is damaged, the system will check the syntax of pica.conf, and a syslog message is provided, go to step 3.

2. Load pica_startup.boot file.

If load pica_startup.boot file successfully, it will go on with the normal boot process.
If failed to load pica_startup.boot file, the system will check the syntax of pica.conf, and a syslog message is provided, go to step 3.

3. Check the syntax of pica.conf file.

If the result of the check is success, the system will load pica.conf file, go to step 4.
If the result of the check is fail, that is, the pica.conf file is damaged, the system will load pica_default.boot file, and a syslog message is provided, go to step 5.

4. Load pica.conf file.

If load pica.conffile successfully, it will go on with the normal boot process.
If failed to load pica.conf file, the system will load pica_default.boot file, and a syslog message is provided, go to step 5.

5. Load pica_default.boot file in directory /pica/etc/platform_name (For example, on AS5712_54X, pica_default.boot file is in the /pica/etc/as5712_54x directory), and go on with the normal boot process.

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