Hi Wookey, On 11/27/2013 10:58 AM, Wookey wrote: > +++ Michael Hudson-Doyle [2013-11-27 10:51 +1300]: >> Hi all, >> >> Do we have, or do we have plans for, an image that's based on Ubuntu >> that's usable with the foundation model? The only part I don't know how >> to do for myself is build the .axf file, which I guess I can teach >> myself but it would be even easier to just download something :-) > > Which sort of image did you have in mind? presumably arm64 as you are using > the model? > > I've used ubuntu rootfs with the .axf files from the OE image. The only > thing you have to change is the kernel command line (which of course > the axf wrapper makes awkward - see below). > > Here is an ubuntu arm64 rootfs + suitable kernel images > http://people.debian.org/~wookey/bootstrap/rootfs/ > (and a debian one as of last week) > https://wiki.debian.org/Arm64Port#Pre-built_Rootfs > > They also work (a whole lot faster) with qemu. > > There is a wiki page somewhere for wrapping your own kernel with > bootwrapper foo, but I found it much easier to use a handy internal tool which > rewrites the kernel command line inside a .axf file, which makes it a > one-liner to turn a working OE kernel .axf from linaro snapshots into > one that works for an ubuntu image. > > This is nothing more than some unpacking + objdump runes, but of course > being arm-written software (by Jim) would probably take months of > tiresome effort arguing with lawyers to get it released, so you can't use it. > :-( > > It could get turned into a wiki page of runes if there is demand...
In my opinion, the nicer solution is to port the semihosting boot wrapper to 64-bit. We've done that internally, but don't currently have approval to share that work. It's not too difficult though--basically just drop the AArch64 boot.S into the 32-bit bootwrapper code with semihosting support and you're most of the way there. A simulator with instruction tracing or stepping is probably necessary for debugging. One can also use UEFI as a semihosting bootloader, hence my interest in data on the overhead. Regards, Christopher -- Employee of Qualcomm Innovation Center, Inc. Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by the Linux Foundation. _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
