PlayStation 3 homebrew developer, glevand, has released a custom firmware that will boot your PlayStation 3 directly into petitboot, which then presents you with the option of immediately booting your console into GameOS or Linux. After several hours of experimentation, glevand was finally successful and his theories regarding the GameOS loader were proven correct. The developer proudly released his firmware along with the following statement:
Got cold boot working on PS3 Slim
My theory was right, i patched the initial GOS loader in process 9 of LPAR1 and it works now.
I can cold boot my petitboot with just pressing power button once.