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02-18-2008, 08:11 AM
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 Re: Size of kernels Hello! On Thu, Nov 17, 2005 at 10:55:14PM +0100, Rickard Dahlstrand wrote: >[...] >>>RAM is getting cheaper and the devices I'm using right now have at least >>>256 MB of ram. The ramdisk-kernels have many advantages for the systems >>>I build the limited ramdisk-size is making it hard to get things done. >>>When using Flashboot and the ramdisk kernels you have a limit of >>>currently 14 MB if I have understand Damien's text from the flashboot >>>readme-file. Is this limit static or it there something that can be changed. >>Perhaps you could have a relatively small ramdisk as root filesystem, >>and later mount a MFS and populate it from somewhere, e.g. a readonly fs >>from flash (mount_mfs ... -P) or by restore(8)ing a (optionally >>gzipped/bzip2'ed) dump. >Yes, that's the approach I'm using now, but it would be so nice to have >more stuff in the default dist. like Perl, Apache etc. Could you explain what's your real problem with having them in the second stage, i.e. in the mfs? mfs has much less restrictive size limits than the kernel ramdisk (rd) device. So your flash could be laid out like this: a: enough to hold /boot, perhaps /etc/boot.cf, and /bsd /bsd is gzipped and has an initial ramdisk with just enough to make the secondary mfs d: either a ffs or even just raw data for populating the mfs The initialization that's contained in the initial ramdisk creates a big enough mfs and populates it, e.g. using some dd if=/dev/rsd0d bs=512 | bunzip2 | restore -r -f - (assuming that the flash is sd0) combo. In the compressed dump in sd0d, there's everything you need, including your perl and apache and whatever. Perhaps have an e: partition for variable data that you want to survive between boots, and mount that in some way. What of your *real* goals (i.e. *what* you want, not your ideas of *how* you want to do it) wouldn't be achieved that way? >Rickard. Kind regards, Hannah.      |
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