[maemo-developers] [maemo-developers] Porting L4-embedded kernel

[From: Carl van_Schaik]

I've now got my serial port connected with three spring-contacts - the type 
used on a bead-of-mails test station. This connected to a FTDI TF232BM 
usb-serial converter chip.

>>A quick look around, I noticed /dev/mtdblock2 it where is seems the 
>>vmlinux image lives, starting at offset 0x800
>>/dev/mtdblock0 is the nolo 'Nokia Loader' code and /dev/mtdblock1 is the 
>>config partition?
>>/dev/mtdblock3 is the initfs?
>
>Yst this is correct. Kernel lives in /dev/mtdblock2 but there appears to be 
>header "NOLO img" + kernel image size an kernel stats at 0x800.
>
>>
>>2. Modifiy the initfs such that very early on, before flash is mounted rw, 
>>have a bootmenu, much like the existing bootmenu program. This could on 
>>selection of L4, load a kernel module which contains the L4 kernel image, 
>>and then "take over" Linux and boot the L4 kernel.
>
>Just a thought, can this module with L4 kernel take over already running 
>linux kernel but leave it running i.e. just hook into interrupt vectors, 
>MMU or whatever? This is how colinux hooks into running NT/XP kernel and 
>runs side by side with it. When done this way you won't need any boot or 
>linux kernel loader.

I don't want to keep Linux around in kernel mode. It is insecure and should 
not be priviledged when running on a kernel like L4. I'll run a copy of the 
Linux kernel para-virtualized as an L4 application.

I think I'll take the kernel module option for now.. .its easier to 
implement for now and I can use my laptop to flash images onto the MMC card.

--
Carl

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