Hi Richard, On Sun, 28 Aug 2016 10:12:31 +0200 Richard Weinberger <rich...@nod.at> wrote:
> Ralph, > > On 28.08.2016 09:10, Ralph Sennhauser wrote: > > Using CONFIG_CMDLINE or the dtb isn't an option either for dual > > firmware devices. You'd have to provide two images, one for each > > partition so the rootfs belonging to the kernel gets mounted. > > Sounds like a recipe for disaster. > > With "image" you mean the uImage? uImage - padding to 6MB - ubinized rootfs. A firmware image as is flashed by users. Linksys set it up so that if one firmware image is broken there is a good chance the bootloader will attempt to boot the other. > Well, then you need to add the cmdline to the DT. > If your bootloader does not support DT loading and you need to append > it to uImage, yes, you'll have to two uImage for these devices. Two uImages / firmware images is probably more problematic than asking the user to fix the kernel parameters passed by u-boot. > Or a initramfs... > > But IMHO it still does not justify adding these hacks to the kernel. > Those hacks can be justified if there is a case an initramfs or CONFIG_CMDLINE/dtb doesn't work. I can't think of such a case right now. > > On the other hand an initramfs can carry the logic to figure out > > which to mount and is what I use for my self. The busybox based > > implementation I use adds a tad over 300Kb to the uImage, perfectly > > acceptable in my case. > > When your minimal initramfs consumes 300KiB you're doing something > wrong. As I said in another thread, for your special purpose you'd > need to create a minitmal userspace for initramfs, no fancy (eg)libc, > just a bare minimum /init program which does the mount probing. > Shouldn’t be more than a few system calls. > > Thanks, > //richard Well, I use busybox because I'm lazy and still get away with only 300Kb. And as I said there is plenty space on my device. (6M per uImage OEM firmware configuration) Cheers Ralph _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
