PS3 dev graf_chokolo has managed to get Service Mode running on the PS3, via Linux, without the need for any of the Jailbreak Dongles.
Guys, take a look at my ps3dm-utils.
Now you can enable service mode from Linux icon smile Graf Chokolo Releases Update To Enable Service Mode From Linux
Look at ps3dm_usb_dongle_auth
Jess a member from the source confirmed that USB dongles were no longer needed to get into service mode:
No you don´t need a dongle! You can invoke it from linux.
Al the modules comunicate throught dm proxy.
Now you can simulate a dongle through software and authenticate through linux.
You can generate the challange and create the adecuate response