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I want my login prompt to come as soon as few necessary drivers are loaded. So for example once SPI driver is loaded, I will put the login prompt application just below SPI driver , and the CPU will execute this login application. Ultimately I will be having a fully running login prompt on the console just after loading of SPI drivers is over.

How can I set a login prompt as soon as possible in the boot sequence? How should I proceed?

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  • are you sue to take the problem in the right order ? you should change your question to how can I set a login prompt as soon as possible in the boot sequence, because asked like this it's very unlikely that you get an answer
    – Kiwy
    Apr 7 '14 at 8:30
  • @Kiwy Kindly edit the title. Your suggestion is correct Apr 7 '14 at 8:35
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    What distribution are you on? You probably want to look at lwn.net/Articles/299483 and systemd based systems for the fastest "prompting".
    – Anthon
    Apr 7 '14 at 8:48
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If you want it AS SOON AS POSSIBLE, you ensure you have all that's necessary in your initramfs image to support this and add this kernel parameter to your bootloader:

init=/bin/login

That will get it up AS SOON AS IS POSSIBLE - if at all.

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  • could you please elaborate on "all that's necessary in your initramfs image to support this" Apr 9 '14 at 12:44
  • is it mandatory to have initramfs if I want a login prompt? let's say I do not want to have any file system at all, can I have login prompt then, once linux boot? Apr 9 '14 at 15:37
  • It is mandatory to have initramfs. All thats necessary would be login's dependencies.
    – mikeserv
    Apr 9 '14 at 18:05

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