As shipped, Debian Jessie (8.0) did not include kernel support for the USB controller on APM X-Gene based machines like the Mustang. At the time of writing this (May 2015) some of that support has gone upstream into the mainline Linux kernel, but there is another patch still needed (as posted by Mark Langsdorf from Red Hat).
This lack of kernel support means that installing Debian is more awkward than it could be on these machines. They don't have optical drives fitted normally, so the neat isohybrid CD images that we have made in Debian so far won't work very well at all. Booting via UEFI from a USB stick will work, but then the installer won't be able to read from the USB stick at all and you're stuck. :-( The best way so far for installing Debian is to do a network installation using tftp etc.
The image here includes a patched kernel, plus a locally-built version of debian-installer using that kernel (but no other changes). The necessary changes should hopefully make it into the Jessie kernel in time for the 8.1 point release, then this image will be made obsolete by the normal Jessie images for that point release.
To use this image, your Mustang will need to be running the latest UEFI-based firmware; I've tested using Mustang software release 1.15.10, which reports as:
Boot firmware (version 1.1.0 built at 11:31:29 on Apr 22 2015) TianoCore 1.1.0 UEFI 2.4.0 Apr 22 2015 11:30:25This includes the needed definitions for the on-chip USB3 controller in the DTB that is embedded in the UEFI firmware.
Due to the way the Mustang firmware works (it looks like it modifies some of the DTB as it boots so it can give details about CPU setup etc.), supplying an updated DTB later looks like it could be prone to failure. So updating the firmware is very much the recommended route here. Check on https://myapm.apm.com/ for firmware/software downloads if necessary.
Download this ISO image, verify it if desired, then write it directly to a USB stick using dd or cp:
# dd if=debian-8.0.1-beta-arm64-NETINST-1.iso of=/dev/sdX bs=4M
then plug the USB stick into your Mustang. Use a serial conection to the machine for the console, 115200-8-N-1. Turn the machine on, break into the boot sequence and start a (UEFI) Shell from the UEFI menu. You will be presented with a display something like this (the exact details may vary depending on the disks and filesystems you have connected):
UEFI Interactive Shell v2.0 EDK II UEFI v2.40 (X-Gene Mustang Board EFI Apr 22 2015 11:32:34, 0x00000000) Mapping table FS1: Alias(s):CD9a0a:;BLK6: PciRoot(0x8)/Pci(0x0,0x0)/USB(0x0,0x0)/CDROM(0x0) FS2: Alias(s):CD9a0b0:;BLK8: PciRoot(0x8)/Pci(0x0,0x0)/USB(0x0,0x0)/HD(1,MBR,0x00000000,0x0,0x6D000)/CDROM(0x0) FS3: Alias(s):HD9a0c:;BLK9: PciRoot(0x8)/Pci(0x0,0x0)/USB(0x0,0x0)/HD(2,MBR,0x00000000,0x6D000,0x800) FS0: Alias(s):HD7a0a1:;BLK1: PciRoot(0x6)/Pci(0x0,0x0)/Sata(0x0,0x0,0x0)/HD(1,GPT,74AE74A1-3B14-40D4-BABE-720E53186DAA,0x800,0x1DC800) BLK11: Alias(s): VenHw(6C9CEEF0-A406-11E3-A5E2-0800200C9A66) BLK10: Alias(s): VenHw(02118005-9DA7-443A-92D5-781F022AEDBB) BLK13: Alias(s): VenHw(F40A3869-92C4-4275-8501-4491A1A20C19) BLK12: Alias(s): VenHw(B225ED30-6DFD-43A9-BF6B-5753358F2F70) BLK5: Alias(s): PciRoot(0x8)/Pci(0x0,0x0)/USB(0x0,0x0) BLK7: Alias(s): PciRoot(0x8)/Pci(0x0,0x0)/USB(0x0,0x0)/HD(1,MBR,0x00000000,0x0,0x6D000) BLK0: Alias(s): PciRoot(0x6)/Pci(0x0,0x0)/Sata(0x0,0x0,0x0) BLK2: Alias(s): PciRoot(0x6)/Pci(0x0,0x0)/Sata(0x0,0x0,0x0)/HD(2,GPT,EE5144F7-7DD0-48D7-A030-D8D49B21C2BF,0x1DD000,0x5D22000) BLK3: Alias(s): PciRoot(0x6)/Pci(0x0,0x0)/Sata(0x0,0x0,0x0)/HD(3,GPT,6F7C838E-B56F-4B1D-9D7B-7738961188F8,0x5EFF000,0x2540800) BLK4: Alias(s): PciRoot(0x6)/Pci(0x0,0x0)/Sata(0x0,0x0,0x0)/HD(4,GPT,68AD2397-DC7B-4E85-930B-39709E6E64C7,0x843F800,0x31F46000) Press ESC in 1 seconds to skip startup.nsh or any other key to continue. Shell>
Next, select the USB stick "CDROM" filesystem - look for the
USB(0x0,0x0)/CDROM(0x0) entry (
FS1 in my
case). Then, start the installer by typing the path to it on the
Shell> fs1: FS1:\> efi\boot\bootaa64.efi
This will then show a Grub bootloader screen:
GNU GRUB version 2.02~beta2-22 *Install Advanced options ... Install with speech synthesis
There's one last step needed here to get the installer going - you
need to tell the installer kernel the speed and location of the
console. (This hopefully will be fixed in the near future, but will
need another DTB update.) Hit e to edit the boot
entry for the
Install option, and edit
linux entry to remove the
--- quiet text
GNU GRUB version 2.02~beta2-22 setparams 'Install' set background_color=black linux /install.a64/vmlinuz console=ttyS0,115200n8 initrd /install.a64/initrd.gz
Ctrl-x now, as prompted at the bottom of this
screen, and you're off and running. For help with the rest of the
installer from this point, read
Ask me - firstname.lastname@example.org
Name Last modified SizeApache/2.4.33 (Unix) Server at cdimage.debian.org Port 80
Parent Directory - MD5SUMS 2015-05-19 11:12 72 MD5SUMS.sign 2015-05-19 11:13 819 SHA1SUMS 2015-05-19 11:12 80 SHA1SUMS.sign 2015-05-19 11:13 819 SHA256SUMS 2015-05-19 11:12 104 SHA256SUMS.sign 2015-05-19 11:13 819 SHA512SUMS 2015-05-19 11:12 168 SHA512SUMS.sign 2015-05-19 11:13 819 debian-8.0.1-beta-arm64-NETINST-1.iso 2015-05-19 11:10 219M