Re: [MirageOS-devel] Mirage on Xen/ARM status

[Anil Madhavapeddy <anil@xxxxxxxxxx>]

Woohoo!!  This is awesome progress!  That's all I really have to say
until I refresh my trees and build a kernel, so I'll repeat myself.

Woohoo!!

-anil

On 16 May 2014, at 17:41, Thomas Leonard <talex5@xxxxxxxxx> wrote:

> Good news for Mirage on Xen/ARM: mirage-skeleton/console is now working!
> 
> It needs tidying up, but currently to run you need:
> 
> 1. mirage-platform/arm-hacks3:
> https://github.com/talex5/mirage-platform/tree/arm-hacks3
> 
> This has been updated for the new Mini-OS. dietlibc is gone (we no
> longer need a C library). libm is also gone, but you'll need to
> replace it with something else (see below). There's a new libxencaml
> with the separated-out Mini-OS OCaml bindings.
> 
> I had to make some changes to the Mirage API, because on ARM Xen
> doesn't provide start_info. Also, I switched the timer stuff to use
> mini-os's block_domain call, which handles ARM correctly.
> 
> 2. mirage-console/master (modified to avoid using start_page)
> https://github.com/talex5/mirage-console/commits/master
> 
> 3. openlibm/arm-hacks (disables all long double support, which ARM
> doesn't have and OCaml doesn't need)
> https://github.com/talex5/openlibm/tree/arm-hacks
> 
> 4. Mini-OS/devel (can now be installed as a library, libminios.a - use
> "make install-ocamlfind")
> https://github.com/talex5/xen/tree/devel
> 
> 
> You'll also need a *soft-float* ARM build machine. Hard-float would
> require extra support from Mini-OS. You can cross-compile the C code
> easily enough, but OCaml can't cross compile, even from armhf to armel
> (the -ffpu option just gives a silly error message). I got mine with:
> 
>  debootstrap --arch armel testing /mnt
> 
> Finally, you'll also need to modify mir-console's Makefile, because I
> didn't update mirage to generate it properly. This worked for me:
> 
> KERNEL_DIR = $(shell ocamlfind query minios-kernel)
> PLATFORM_DIR = $(shell ocamlfind query mirage-xen)
> 
> build: main.native.o
>        ld -d -static -nostdlib -T $(KERNEL_DIR)/link.lds \
>                --start-group  \
>                /usr/lib/gcc/arm-linux-gnueabi/4.8/libgcc.a \
>                  $(PLATFORM_DIR)/libocaml.a \
>                  $(PLATFORM_DIR)/libxencaml.a \
>                  ~/lib/libopenlibm.a \
>                  $(KERNEL_DIR)/libminios.a -o mir-console.elf \
>                  _build/main.native.o \
>          --end-group
>        objcopy -O binary mir-console.elf mir-console.xen
> 
> The next steps are to make this all a bit easier to install and clean
> up the branches so they can be merged. Also, some things are broken
> (printf doesn't accept %f, for example, because we're just using
> Mini-OS's version).
> 
> 
> -- 
> Dr Thomas Leonard        http://0install.net/
> GPG: 9242 9807 C985 3C07 44A6  8B9A AE07 8280 59A5 3CC1
> GPG: DA98 25AE CAD0 8975 7CDA  BD8E 0713 3F96 CA74 D8BA
> 
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> 


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