Booting Linux from Flash
alex at signum.se
Fri Apr 16 02:06:32 EST 1999
brendan at dgs.monash.edu.au (Brendan Simon) writes:
> I would certainly like to get a flash filesystem driver. I'm not sure if it
> is the same thing you are talking about.
> I want to boot linux on an powerpc embedded system which has no hard disk. I
> do not want to use lilo. I imagine that I would have write a simple
> bootloader to get the kernel booting. I want to store the kernel at a known
> location in Flash and store a boot image at a known location in Flash. I then
> want to execute the kernel somehow (jump to appropriate address) and pass to
> it any parameters required to let it place the boot image in a ram disk. I
> think the kernel lives in the file system so it's a bit of a chicken and egg
> problem as far as I can see. Is the kernel that is booting stored in the boot
> image. If so I guess the boot image has to be uncompressed. The root
> filesystem can be a compressed image though.
The way I'm doing it is i just place the bootcode and a zImage at place in the
flash-mem where the machine boots. Then i just set up the machine and copy the
zImage down to ram and jump to it.
You could probably get it to read a compressed fs image from flash and mount it
as a ram-disk by either using some initrd hacking or doing some kernel startup
> Anyone know where I should start with regards to bootloaders or how to get the
> kernel booting if I have the kernel and bootimage in Flash somewhere. Note
> the Flash is just memory mapped on a SIMM. There is no IDE driver or
> filesystem on it. Do I need a Flash device driver ??
No, you don't need a Flash device driver unless you want to write to the flash.
[[ This message was sent via the linuxppc-dev mailing list. Replies are ]]
[[ not forced back to the list, so be sure to Cc linuxppc-dev if your ]]
[[ reply is of general interest. Please check http://lists.linuxppc.org/ ]]
[[ and http://www.linuxppc.org/ for useful information before posting. ]]
More information about the Linuxppc-dev