This got me into a single-user shell and allowed me to use the Unix "passwd" command to set the Linux user password for "root" and "customer". But it offers a path to append your own parameters with "$othbootargs". Note how it overwrites bootargs (setenv bootargs). Off console=$consoledev,$baudrate $othbootargs Setcfargs=setenv bootargs root=/dev/$cfdrive rw ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname:$netdev: You now need to hunt the different variables references. They look all like:Ĭfcfboot=run setcfargs ext2load ide 0:1 $loadkernaddr uImage bootm $loadkernaddr But this device did overwrite the "bootargs" variable as part of the bootup process.Ī few different environment variables (= commands) are defined for different boot processes. In u-boot, you set environment variables to commands, and then you execute the environment variable (at least that is my best understanding of the process). Most guides suggest setting the "bootargs" variable at this point. You are not presented with a u-boot prompt. You start the system and press any key early in the boot process. This system, like many similar "embedded" Linux systems, used u-boot, a different bootloader that works a bit "odd" (at least to me as a grub user). With grub, you are able to change kernel parameters during boot pretty easily. Most modern Linux systems use the grub boot loader. This is the password I needed to figure out at this point. After boot, the system started the custom software, and it maintains its own username/password combination. There are two users: root and "customer".
I also wasn't able to connect with ssh even though it looked like the unit using the default IP address (but maybe some filter was set up?). the default username password did not work (admin/netoptics).
#U BOOT BOOTARGS SERIAL#
I was even able to get the serial console working on the first try (this unit had a DB9 serial connector which takes the guesswork out of which RJ45 adapter I need to use).īut. The device arrived and looked in reasonable condition and booted up. But making equipment like that work is part of the fun.
#U BOOT BOOTARGS MANUALS#
I am not sure how long ago the Director line of equipment went "EOL" and was only able to find manuals on 3rd party websites. Of course, equipment like this usually comes with no warranty, and vendor support can be spotty in particular as Netoptics now only exists as a part of IXIA and IXIA has been purchased by Keysight. This time, I picked up a Netoptics Director including inline modules for about $100. While I do not recommend using used equipment from eBay for production, surplus equipment can be a great opportunity to supplement a home lab.
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