The APM X-C1 (code name Mustang) is a server chip under their X-GENE family of products.

First Look[edit]

The APM unit is a compact box. Because it has no graphical output, the sole means to interface with it out of the box is via serial.

The box talks at 19200 baud (ie: screen /dev/ttyS0 19200)

BIOS[edit]

U-Boot[edit]

The board came with U-Boot loaded. When the system is first turned on, you will see the following in the console:

U-Boot 2013.04-mustang_sw_1.12.09-beta (Jun 12 2014 - 10:48:45)

CPU0: APM ARM 64-bit Potenza Rev A3 2400MHz PCP 2400MHz
     32 KB ICACHE, 32 KB DCACHE
     SOC 2000MHz IOBAXI 400MHz AXI 250MHz AHB 200MHz GFC 125MHz
Boot from SPI-NOR
Board: Mustang - AppliedMicro APM883208-xNA24SPT Reference Board
I2C:   ready
DRAM:  ECC 16 GiB @ 1600MHz
SF: Detected N25Q256 with page size 256 Bytes, total 32 MiB
MMC:   X-Gene SD/SDIO/eMMC: 0
PCIE0: (RC) link down
In:    serial
Out:   serial
Err:   serial
CPUs:  11111111
Net:   eth0

Here are the environment variables that are set in the U-Boot shell out of the box:

Mustang# printenv
addip=setenv bootargs ${bootargs} ip=${ipaddr}:${serverip}:${gatewayip}:${netmask}:${hostname}:${netdev}:off panic=1
addmisc=setenv bootargs ${bootargs} earlyprintk=uart8250-32bit,0x1c020000 debug maxcpus=${num_cores} swiotlb=65536
addtty=setenv bootargs ${bootargs} console=ttyS0,${baudrate}
baudrate=115200
bootcmd=run sata_self
bootdelay=5
bootfile=uImage
dnsip=10.66.18.10
enet=8
enet_mode=x:n
eth1addr=00:01:73:02:21:35
eth2addr=00:01:73:02:21:36
eth3addr=00:01:73:02:21:37
ethact=eth0
ethaddr=00:01:73:02:21:34
fdt_addr_f=0x1000000
fdt_addr_r=0x4003000000
fdt_file=apm-mustang.dtb
fdt_size=7285
flash_nfs=run nfsargs addip addtty addmisc; bootm ${kern_addr_f}
flash_self=run ramargs addip addtty addmisc; bootm ${kern_addr_f} ${ramdisk_addr_f} ${fdt_addr_f}
fw_addr_r=0x4003800000
gatewayip=10.66.19.1
hostname=dhcp-10-66-19-173
initrd_high=0x43e0000000
ipaddr=10.66.19.173
kern_addr_f=0x100000
kern_addr_r=0x4002000000
kern_size=a9a050
kernel_addr_r=0x4002000000
load=tftp ${uboot_addr_r} ${user_dir}/${u-boot}
load_fdt=tftp ${fdt_addr_r} ${user_dir}/${fdt_file}
load_kern=tftp ${kern_addr_r} ${user_dir}/${bootfile}
load_ramdisk=tftp ${ramdisk_addr_r} ${user_dir}/${ramdisk_file}
loadaddr=0x100000000
media_addr_r=0x4001000000
media_img=mustang_media.img
mgmt_enet=e
mslim_bootfile=uImage-mslim
mslim_fdt_addr_r=0x43f0600000
mslim_fdt_file=mslim-mustang.dtb
mslim_kern_addr_r=0x43f1000000
mslim_net_self=run net_load_mslim; startmslim
mslim_ramdisk_addr_r=0x43f2000000
mslim_ramdisk_file=uRamdisk-mslim
mslim_sd_self=run sd_load_mslim; startmslim
mslim_uboot_addr_r=0x43f0000000
mslim_uboot_file=u-boot-mslim.bin
mslim_user_dir=mslim
net_load_mslim=run nload_mslim_uboot nload_mslim_kern nload_mslim_ramdisk nload_mslim_fdt
net_nfs=run load_kern load_fdt; run nfsargs addip addtty addmisc; bootm ${kern_addr_r} - ${fdt_addr_r}
net_sata=run load_kern load_fdt; run sataargs addip addtty addmisc; bootm ${kern_addr_r} - ${fdt_addr_r}
net_self=run net_self_load; run ramargs addip addtty addmisc; bootm ${kern_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}
net_self_load=run load_kern load_ramdisk load_fdt
netdev=eth0
netmask=255.255.255.0
nfsargs=setenv bootargs root=/dev/nfs rw nfsroot=${serverip}:${rootpath}
nload_mslim_fdt=tftp ${mslim_fdt_addr_r} ${mslim_user_dir}/${mslim_fdt_file}
nload_mslim_kern=tftp ${mslim_kern_addr_r} ${mslim_user_dir}/${mslim_bootfile}
nload_mslim_ramdisk=tftp ${mslim_ramdisk_addr_r} ${mslim_user_dir}/${mslim_ramdisk_file}
nload_mslim_uboot=tftp ${mslim_uboot_addr_r} ${mslim_user_dir}/${mslim_uboot_file}
num_cores=8
pcie_gen=3:3:3:3:3
pcie_mode=RP:NA:NA:NA:NA
pcie_reset=y:n:n:n:n
pxefile_addr_r=0x4001000000
ram_nfs=run nfsargs addip addtty addmisc; bootm ${kern_addr_r} - ${fdt_addr_r}
ram_self=run ramargs addip addtty addmisc; bootm ${kern_addr_r} ${ramdisk_addr_r} ${fdt_addr_r}
ramargs=setenv bootargs root=/dev/ram rw
ramdisk_addr_f=0x1100000
ramdisk_addr_r=0x4004000000
ramdisk_file=uRamdisk_basic
ramdisk_size=344abe
rgmii_phyid=3
rootpath=/opt/nfsrootfs/arm64/release
sata=0x3c
sata_enet=e:e:n:n
sata_load_fdt=ext4load scsi 0:1 0x4003000000 apm-mustang.dtb
sata_load_kern=ext4load scsi 0:1 0x4002000000 uImage
sata_self=scsi init; run sata_load_kern sata_load_fdt; run sataargs addip addtty addmisc; bootm 0x4002000000 - 0x4003000000
sataargs=setenv bootargs root=/dev/sda1 rw
script_addr_r=0x4004000000
sd_load_mslim=mmc dev 0; run sdload_mslim_uboot sdload_mslim_kern sdload_mslim_ramdisk sdload_mslim_fdt
sd_self=mmc dev 0; ext2load mmc 0  ${kern_addr_r} ${bootfile}; ext2load mmc 0  ${fdt_addr_r} ${fdt_file}; ext2load mmc 0  ${ramdisk_addr_r} ${ramdisk_file}; run ram_self
sdload_mslim_fdt=ext2load mmc 0 ${mslim_fdt_addr_r} ${mslim_fdt_file}
sdload_mslim_kern=ext2load mmc 0 ${mslim_kern_addr_r} ${mslim_bootfile}
sdload_mslim_ramdisk=ext2load mmc 0 ${mslim_ramdisk_addr_r} ${mslim_ramdisk_file}
sdload_mslim_uboot=ext2load mmc 0 ${mslim_uboot_addr_r} ${mslim_uboot_file}
sdphy=1
serverip=10.66.19.133
sgmii_phyid=4:5::
spi_fdt_upd=run load_fdt; setenv fdt_size ${filesize}; save; run update_fdt
spi_fw_img=mustang_slimpro_ext_spi.bin
spi_fw_load=tftp ${fw_addr_r} ${user_dir}/${spi_fw_img}
spi_fw_upd=run spi_fw_load;run spi_fw_update
spi_fw_update=bmc stop; i2c dev 1; eeprom write ${fw_addr_r} 0x0 ${filesize}
spi_kern_upd=run load_kern; setenv kern_size ${filesize}; save; run update_kern
spi_load=tftp ${media_addr_r} ${user_dir}/${media_img}
spi_ramdisk_upd=run load_ramdisk; setenv ramdisk_size ${filesize}; save; run update_ramdisk
spi_self=sf probe 0; sf read ${kern_addr_r} ${kern_addr_f} ${kern_size}; sf read ${fdt_addr_r} ${fdt_addr_f} ${fdt_size}; sf read ${ramdisk_addr_r} ${ramdisk_addr_f} ${ramdisk_size}; run ram_self
spi_upd=run spi_load;run spi_update
spi_update=sf probe 0; sf erase 0x0 ${filesize}; sf write ${media_addr_r} 0x0 ${filesize}
stderr=serial
stdin=serial
stdout=serial
u-boot=u-boot.bin
uboot_addr_f=0x8100000000
uboot_addr_r=0x4001000000
uboot_size=0x80000
upd=run load; setenv uboot_size ${filesize};run update
updall=run spi_kern_upd; run spi_ramdisk_upd; run spi_fdt_upd
update=protect off ${uboot_addr_f} +${uboot_size}; erase ${uboot_addr_f} +${uboot_size}; cp.b ${uboot_addr_r} ${uboot_addr_f} ${uboot_size}
update_fdt=sf probe 0; sf erase ${fdt_addr_f} ${filesize}; sf write ${fdt_addr_r} ${fdt_addr_f} ${filesize}
update_kern=sf probe 0; sf erase ${kern_addr_f} ${filesize}; sf write ${kern_addr_r} ${kern_addr_f} ${filesize}
update_ramdisk=sf probe 0; sf erase ${ramdisk_addr_f} ${filesize}; sf write ${ramdisk_addr_r} ${ramdisk_addr_f} ${filesize}
user_dir=/1.12.09-Beta/BUILDS/potenza
xgmii_phyid=:

Environment size: 5832/32764 bytes

The system comes with their version of Linux installed. It's using a custom version of the 3.12 Linux Kernel. Interestingly, the hostname does not reflect the actual IP address, so most likely it's the IP from a network install from the factory.

POWERED BY:

     X     X             GGGG
      X   X             G    G
       X X             G         EEEEE   N NNNN    EEEEE
        X     #######  G   GGG  E     E  NN    N  E     E
       X X             G     G  EEEEEEE  N     N  EEEEEEE
      X   X             G    G  E        N     N  E
     X     X             GGGGG   EEEEE   N     N   EEEEE   (TM)

     Welcome to Applied Micro X-Gene 64-bit ARM Server Platform

Applied Micro Linux 3.12.0-mustang_sw_1.12.09-beta (aarch64) (ttyS0)
dhcp-10-66-19-173 login: root
Password:
[root@dhcp-10-66-19-173 ~]# cat /proc/cpuinfo
Processor       : AArch64 Processor rev 0 (aarch64)
processor       : 0
model name      : APM X-Gene Mustang board @ 2.40GHz
cpu MHz         : 2400.00
fpu             : yes

processor       : 1
model name      : APM X-Gene Mustang board @ 2.40GHz
cpu MHz         : 2400.00
fpu             : yes

processor       : 2
model name      : APM X-Gene Mustang board @ 2.40GHz
cpu MHz         : 2400.00
fpu             : yes

processor       : 3
model name      : APM X-Gene Mustang board @ 2.40GHz
cpu MHz         : 2400.00
fpu             : yes

processor       : 4
model name      : APM X-Gene Mustang board @ 2.40GHz
cpu MHz         : 2400.00
fpu             : yes

processor       : 5
model name      : APM X-Gene Mustang board @ 2.40GHz
cpu MHz         : 2400.00
fpu             : yes

processor       : 6
model name      : APM X-Gene Mustang board @ 2.40GHz
cpu MHz         : 2400.00
fpu             : yes

processor       : 7
model name      : APM X-Gene Mustang board @ 2.40GHz
cpu MHz         : 2400.00
fpu             : yes

Features        : fp asimd
CPU implementer : 0x50
CPU architecture: AArch64
CPU variant     : 0x0
CPU part        : 0x000
CPU revision    : 0

Hardware        : APM X-Gene Mustang board


Flashing Tianocore UEFI Bios[edit]

To update the BIOS from U-BOOT[edit]

Copy your MAC address
If you are upgrading form UBoot, your Mustang box will lose its configured MAC address during the flashing process. Make sure you copy the MAC address *before* you do anything.

When upgrading the BIOS (called Tianocore), you may also want to upgrade the firmware as well (called Slimpro). Both can be obtained from MyAPM's website. The latest version as of this writing is version 3.06.25b released in 2016.

  1. Create the SD card that will contain the UEFI bios. Copy the tianocore firmware file BUILDS/potenza/tianocore_media.img to a SD card dd if=BUILDS/potenza/tianocore_media.img of=/dev/sdx.
  2. Power off the board
  3. Configure the board to boot from the SD card by connecting jumpers 11-12 and 17-18 on the motherboard.
  4. Insert the SD card
  5. Create a USB stick containing the BIOS (tianocore) and optionally the firmware (Slimpro) files

Power on the board again. It should boot directly to the UEFI Tianocore BIOS from the SD card. Enter the UEFI shell and apply the BIOS and firmware updates (see the section on updating the BIOS below).

Once completed, poweroff the board. Revert the jumpers and remove the SD card and USB stick.

When the machine powers up again, it should boot into the Tianocore UEFI BIOS. The MAC address out of the box will be set to 00:00:00:00:00:00 and may cause issues with the OS trying to bring the network up. Fix this by going back to the UEFI shell and run:

# set MAC0 00:01:73:02:1e:10

For more information on flashing the APM Mustang's firmware, see https://marcin.juszkiewicz.com.pl/2015/11/18/unbricking-apm-mustang/.


Updating the BIOS[edit]

Once your board is on the UEFI BIOS, updating the BIOS or firmware is easy.

## Download and extract mustang_tianocore_binaries_3.06.25.tar.xz
## Download and extract the slimpro files as well
## Copy the files to the root directory of a FAT formatted USB drive.
# cp mustang_binaries/* /mnt/usb
# cp slimpro_binaries/* /mnt/usb
# ls -al
total 6.4M
drwxr-x---. 2 root root  16K Jul 17 10:37 ./
drwxr-xr-x. 3 root root 4.0K Jul 14 10:46 ../
-rwxr-x---. 1 root root   64 Jul 17 10:07 apm_upgrade_mustang_slimpro.cmd*
-rwxr-x---. 1 root root   64 Jul 17 10:37 apm_upgrade_mustang_tianocore.cmd*
-rwxr-x---. 1 root root 2.1M Jul 17 10:37 mustang_firmware_capsule.Cap*
-rwxr-x---. 1 root root  46K Jul 17 10:07 mustang_slimpmpro_capsule.Cap*
-rwxr-x---. 1 root root  46K Jul 17 10:07 mustang_slimpro_ext.bin*
-rwxr-x---. 1 root root  46K Jul 17 10:07 mustang_slimpro_ext_spi.bin*
-rwxr-x---. 1 root root  31K Jul 17 10:07 mustang_slimpro_run.bin*
-rwxr-x---. 1 root root 2.1M Jul 17 10:37 mustang_tianocore_media.img*
-rwxr-x---. 1 root root 256K Jul 17 10:37 mustang_tianocore_sec_spi.fd*
-rwxr-x---. 1 root root 1.8M Jul 17 10:37 mustang_tianocore_spi.fd*
-rwxr-x---. 1 root root   32 Jul 17 10:07 spi_bsc.bin*
-rwxr-x---. 1 root root  58K Jul 17 10:37 UpgradeFirmware.efi*
# umount /mnt/usb

## Plug the USB to the APM board and restart it.
## On the serial console, enter the EFI Shell. You should see the files on the USB
FS0:\> FS2:
FS2:\> dir
Directory of: FS2:\
07/17/2017  10:07                  64  apm_upgrade_mustang_slimpro.cmd
07/17/2017  10:07              46,672  mustang_slimpmpro_capsule.Cap
07/17/2017  10:07              46,608  mustang_slimpro_ext.bin
07/17/2017  10:07              46,640  mustang_slimpro_ext_spi.bin
07/17/2017  10:07              30,984  mustang_slimpro_run.bin
07/17/2017  10:07                  32  spi_bsc.bin
07/17/2017  10:12              58,944  UpgradeFirmware.efi
          7 File(s)     229,944 bytes
          0 Dir(s)


## Upgrade the BIOS
FS2:\> UpgradeFirmware.efi 

Firmware Upgrader
Update Firmware via USB/SD/SATA
Enter command file path: apm_upgrade_mustang_tianocore.cmd

Writing Tianocore firmware from the file: mustang_tianocore_media.img
Writing the firmware. Please wait...

Upgrade the firmware successfully

**************************

## Upgrade the firmware
FS2:\> UpgradeFirmware.efi

Firmware Upgrader
Update Firmware via USB/SD/SATA
Enter command file path: apm_upgrade_mustang_slimpro.cmd

Writing firmware from the file: mustang_slimpro_ext_spi.bin
Writing Slimpro....

Validating Firmware.... 
Slimpro/PMpro upgraded successfully

**************************

## Reboot the machine
FS2:\> reset

When the board comes back up, you should hopefully see the updated BIOS version.

Boot firmware (version 3.06.25 built at 13:52:18 on Oct 17 2016)
DRAM ver. 2016_0808
DRAM: 16GB DDR3 1600 ECC
 MCU[0]-Slot[0]: UDIMM[ID:2C80] 18JSF1G72AZ-1G9E1 8GB 2 rank(s) x8
 MCU[2]-Slot[0]: UDIMM[ID:2C80] 18JSF1G72AZ-1G9E1 8GB 2 rank(s) x8


Installing Fedora[edit]

Installing Fedora on the board is made very easy since Fedora 24. Simply download the boot.iso Fedora AARCH64 image and dd it to a USB drive. You can then start the Fedora installer via the UEFI shell.

For a netinstall or an automated install, edit the boot option in grub and specify a kickstart file by passing the ks= option to the kernel.

Insert the Fedora USB stick to the first USB port. When the UEFI loader starts, enter the shell.

## Starting application at 0x1D000000 ...
X-Gene Mustang Board
Boot firmware (version 1.1.0 built at 12:03:43 on Mar 23 2015)
PROGRESS CODE: V3020003 I0
PROGRESS CODE: V3020002 I0
PROGRESS CODE: V3020003 I0
PROGRESS CODE: V3020002 I0
PROGRESS CODE: V3020003 I0
PROGRESS CODE: V3020002 I0
PROGRESS CODE: V3020003 I0
PROGRESS CODE: V3021001 I0
TianoCore 1.1.0 UEFI 2.4.0 Mar 23 2015 12:03:18
CPU: APM ARM 64-bit Potenza Rev A3 2400MHz PCP 2400MHz
     32 KB ICACHE, 32 KB DCACHE
     SOC 2000MHz IOBAXI 400MHz AXI 250MHz AHB 200MHz GFC 125MHz
Board: X-Gene Mustang Board
Slimpro FW:
        Ver: 2.1
The default boot selection will start in   4 seconds
[1] Shell
[2] Boot Manager
[3] Reboot
[4] Shutdown
Start: 1

In the UEFI shell, execute:

# FS0:\EFI\BOOT\BOOTAA64.EFI

Depending on where you plugged the USB drive, you may need to go into fs1 instead. If you aren't sure, look at the devices that are listed when the shell initializes and then listing the contents using dir.

The BOOTAA64.EFI program will eventually start grub and from there the Fedora installer.

.
      Install Fedora-Server 26
      Test this media & install Fedora-Server 26
      Troubleshooting -->














      Use the  and  keys to change the selection.
      Press 'e' to edit the selected item, or 'c' for a command prompt.

You may either continue with the installation or edit the boot options and pass in a kickstart file to automate the install process. Keep in mind that this EFI based system requires a /boot/efi partition.

Alt-Tab in a Serial Console
While in a serial console, in order to go to the different tabs in Anaconda, hit the Esc-Tab key combination.

See Also[edit]


Troubleshooting[edit]

Board Crashes on Startup[edit]

When starting the board up, you get:

X-Gene Mustang Board
Boot firmware (version 1.15.23 built at 13:21:52 on Nov 24 2015)
PROGRESS CODE: V3020003 I0
PROGRESS CODE: V3020002 I0
PROGRESS CODE: V3020003 I0
PROGRESS CODE: V3020002 I0
PROGRESS CODE: V3020003 I0
PROGRESS CODE: V3020002 I0
PROGRESS CODE: V3020003 I0
PROGRESS CODE: V3021001 I0


Synchronous Exception at 0x00000043FFA1D024
0: FP 0x00000043FFA78AE0 SP 0x00000043FFA78AE0 PC 0x00000043FFA1D6B0
1: FP 0x00000043FFA78AF0 SP 0x00000043FFA78AF0 PC 0x00000043FFA1D6AC
2: FP 0x00000043FFA78B50 SP 0x00000043FFA78B00 PC 0x00000043FFA1DDC4
3: FP 0x00000043FFA78BD0 SP 0x00000043FFA78B60 PC 0x00000043FF9C4560
4: FP 0x00000043FFA78D10 SP 0x00000043FFA78BE0 PC 0x00000043FFA82D4C
5: FP 0x00000043FFA78D50 SP 0x00000043FFA78D20 PC 0x00000043FFA82914
6: FP 0x00000043FFA78D90 SP 0x00000043FFA78D60 PC 0x00000043FFA831B8
7: FP 0x00000043FFA78DB0 SP 0x00000043FFA78DA0 PC 0x00000043FF9C47E4
8: FP 0x00000043FFA78DE0 SP 0x00000043FFA78DC0 PC 0x00000043FF9C4318
9: FP 0x00000043FFA78E20 SP 0x00000043FFA78DF0 PC 0x00000043FFA7BBD0
10: FP 0x00000043FFA78E70 SP 0x00000043FFA78E30 PC 0x00000043FFA83D60
11: FP 0x00000043FFA78EF0 SP 0x00000043FFA78E80 PC 0x00000043FFA79748
12: FP 0x00000043FFA78FE0 SP 0x00000043FFA78F00 PC 0x00000043FFA79270

This is most likely a mismatch BIOS and Firmware. Try updating to the most recent Tianocore and Slimpro firmware. My temporary workaround to this issue was chainload an older BIOS version via the SD card.

Grub Fails to Start Anaconda Installer[edit]

If Grub doesn't seem to start the installer, make sure that your USB labels match that in grub.cfg.

For example, if grub.cfg contains the line:

search --no-floppy --set=root -l 'Fedora-S-21-aarc'

The USB label should be set to 'Fedora-S-21-aarc':

# lsblk -o name,label
NAME   LABEL
sdb
├─sdb1
└─sdb2 Fedora-S-21-aarc

If the label names are mismatched, grub will not be able to find where root is.


Secondary CPU Cores Are Disabled[edit]

The stock Fedora kernels (tested with 4.0.4-303.fc22.aarch64, 4.2.3-300.fc23.aarch64) is unable to bring the other CPUs online on startup:

[    0.018839] ------------[ cut here ]------------
[    0.018853] WARNING: CPU: 0 PID: 1 at drivers/firmware/dmi_scan.c:649 dmi_matches+0x120/0x128()
[    0.018861] dmi check: not initialized yet.
[    0.018866] Modules linked in:
[    0.018874] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.0.4-303.fc22.aarch64 #1
[    0.018882] Hardware name: APM X-Gene Mustang board (DT)
[    0.018887] Call trace:
[    0.018894] [<fffffe0000097738>] dump_backtrace+0x0/0x150
[    0.018901] [<fffffe00000978a8>] show_stack+0x20/0x30
[    0.018909] [<fffffe000076e9b4>] dump_stack+0x78/0x94
[    0.018915] [<fffffe00000c0888>] warn_slowpath_common+0xa0/0xe0
[    0.018921] [<fffffe00000c0928>] warn_slowpath_fmt+0x60/0x78
[    0.018927] [<fffffe00005de86c>] dmi_matches+0x11c/0x128
[    0.018933] [<fffffe00005de8a4>] dmi_check_system+0x2c/0x70
[    0.018940] [<fffffe0000c4f5e0>] lockup_detector_init+0x10/0x54
[    0.018946] [<fffffe0000c40abc>] kernel_init_freeable+0x108/0x260
[    0.018953] [<fffffe000076b76c>] kernel_init+0x1c/0xe8
[    0.018967] ---[ end trace 514f64f4445b269e ]---
[    0.018973] ------------[ cut here ]------------
[    0.018979] WARNING: CPU: 0 PID: 1 at drivers/firmware/dmi_scan.c:649 dmi_matches+0x120/0x128()
[    0.018987] dmi check: not initialized yet.
[    0.018991] Modules linked in:
[    0.018998] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G        W       4.0.4-303.fc22.aarch64 #1
[    0.019005] Hardware name: APM X-Gene Mustang board (DT)
[    0.019010] Call trace:
[    0.019015] [<fffffe0000097738>] dump_backtrace+0x0/0x150
[    0.019021] [<fffffe00000978a8>] show_stack+0x20/0x30
[    0.019027] [<fffffe000076e9b4>] dump_stack+0x78/0x94
[    0.019033] [<fffffe00000c0888>] warn_slowpath_common+0xa0/0xe0
[    0.019038] [<fffffe00000c0928>] warn_slowpath_fmt+0x60/0x78
[    0.019044] [<fffffe00005de86c>] dmi_matches+0x11c/0x128
[    0.019051] [<fffffe00005de8a4>] dmi_check_system+0x2c/0x70
[    0.019057] [<fffffe0000c4f5e0>] lockup_detector_init+0x10/0x54
[    0.019063] [<fffffe0000c40abc>] kernel_init_freeable+0x108/0x260
[    0.019068] [<fffffe000076b76c>] kernel_init+0x1c/0xe8
[    0.019073] ---[ end trace 514f64f4445b269f ]---
[    1.018060] CPU1: failed to come online
[    2.018179] CPU2: failed to come online
[    3.018300] CPU3: failed to come online
[    4.018418] CPU4: failed to come online
[    5.018544] CPU5: failed to come online
[    6.018662] CPU6: failed to come online
[    7.018782] CPU7: failed to come online
[    7.018797] Brought up 1 CPUs
[    7.018803] SMP: Total of 1 processors activated.

The CPUs will not come online post-startup either:

# echo 1 > /sys/devices/system/cpu/cpu1/online
-bash: echo: write error: Input/output error
# lscpu
Architecture:          aarch64
Byte Order:            Little Endian
CPU(s):                8
On-line CPU(s) list:   0
Off-line CPU(s) list:  1-7
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             1

You can fix this by flashing the Tianocore UEFI bios instead of chainloading it from a SD card.


Error! No DIMMs Detected[edit]

After updating the BIOS to 3.06.25, booting the device now shows

Boot firmware (version 3.06.25 built at 13:52:18 on Oct 17 2016)
Error! No DIMM detected!!!
DRAM ver. 2016_0808
DRAM: 2GB DDR3 1600 ECC
X-Gene Mustang Board

You need to upgrade the firmware. Get the Slimpro binaries from MyAPM and upgrade the firmware as you would the BIOS (using the UEFI shell).

No Output / Kernel Hangs After Booting[edit]

If you don't see any output after these lines:

EFI stub: Booting Linux Kernel...
EFI stub: Using DTB from configuration table
EFI stub: Exiting boot services and installing virtual address map...
L3c Cache: 8MB

The kernel output is probably going to the wrong place. Set the console=ttyS0,115200 as part of the kernel arguments.

Kickstart Storage Issue[edit]

Anaconda bails during an automated install process with the error failed to find a suitable stage1 device as seen during the install process:

Generating updated storage configuration
storage configuration failed: failed to find a suitable stage1 device
================================================================================

================================================================================
Installation

 1) [x] Language settings                 2) [x] Time settings
        (English (United States))                (America/Edmonton timezone)
 3) [x] Installation source               4) [x] Software selection
        (http://linbuild.cs.ucalgary.ca          (Custom software selected)
        /fedora/26/aarch64/os)            6) [x] Network configuration
 5) [!] Installation Destination                 (Wired (eth0) connected)
        (Error checking storage
        configuration)

Since this system is using a UEFI BIOS, it needs to find a /boot/efi partition containing the bootloader. The kickstart file did not contain a /boot/efi partition (it only had a /boot).

Adding the partition made the automated install work again.


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