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+# WM8750
+# Apricot R4 on NAND, for APC.io WM8750
+## Overview
+{{ :gnulinux:wm8750:apc-angle.jpg?nolink&250|}}
+For memory. Adapted from [[http://thunderace94.wordpress.com/2013/06/12/apc-8750-install-raspbian-on-nand-flash/|this repost]], original source: RoyalPanda from APC.IO forum.
+The plot is simple: How to install a _real_ GNU/Linux on the APC.io wm8750 PicoITX board.
+__Royal Panda__ made a great job adapting Raspbian for the APC, he called this remix __Apricot__
+The last release is Apricot R5, but it still lacks Video support (among others things) and __Royal Panda__ didn't release any NAND installer. So this _"tutorial"_ is made with the previous release: Apricot R4. The process should stay the same if there's an update one day...
+Long story short: I needed to reinstall my APC board, but the kernel I had (and though was the one from the installer) lacks the UBI support, so I couldn't follow the original Howto...
+## Steps
+### What you'll need
+* The board itself, the original APC.io board: __[[http://apc.io/products/8750a/|WM8750]]__
+* A 1 Gio MicroSD card
+* An Ethernet connection
+* A Serial adapter
+* Screen and Keyboard might help too...
+### Files
+* The Installer Files with a scriptcmd file (it's easier this way, but don't worry, you'll play with uBoot via Serial)
+* mtd-utils deb package (so you don't have to type the URL to download it)
+* mod-kernel-RaspBian.tar.gz (the Kernel to be flashed on the NAND)
+I've made a bundle with the useful files: {{gnulinux:wm8750:apricotinstaller.tar.gz|Here}}
+* Apricot R4 MMC (for its rootfs): [[http://breizhcloud.eu/depot/Apricot-R4/ApricotR4-NoGUI-1G-SDCARD.img.zip|Here]]
+### MicroSD preparation
+The easy way is to copy the Apricot R4 img on the uSD card, then add the the other files on the first partition.
+    dd if=./ApricotR4-NoGUI-1G-SDCARD.img of=/dev/sdh bs=4096
+There should be one partition named __XCP-1.6.10 Base Pack__. Copy the files initrd.gz, uzImage.bin, scriptcmd, mtd-utils (DEB package) there, replace the existing files (uzImage.bin and scriptcmd)
+Create a folder where you extract the mod-kernel-RaspBian.tar.gz archive. Mine's named __modKern__.
+### First boot
+Insert the MicroSD card, boot the board.
+The debian-installer should start (on the screen, not in serial). Choose your language, you don't need the Network. Stop the installer as soon as you can, and drop to a Shell. From the menu, it's the __Execute a shell__ option.
+Make sure your NAND layout is correct:
+    cat /proc/mtd
+You should see this:
+    dev:    size   erasesize  name
+    mtd0: 00d00000 00010000 "filesystem-SF"
+    mtd1: 00280000 00010000 "kernel-SF"
+    mtd2: 00050000 00010000 "u-boot-SF"
+    mtd3: 00010000 00010000 "u-boot env. cfg. 1-SF"
+    mtd4: 00010000 00010000 "u-boot env. cfg. 2-SF"
+    mtd5: 00010000 00010000 "w-load-SF"
+    mtd6: 00a00000 00100000 "kernel"
+    mtd7: 7f600000 00100000 "rootfs"
+<note warning>If your layout is different, stop here unless you know what you're doing...</note>
+Mount the first partition of the uSD card somewhere, Flash the kernel on the NAND (mtd6)
+    mkdir /mnt
+    mount /dev/mmcblk0p1 /mnt
+    cd /mnt/modKern
+    dd if=uzImage.bin of=/dev/mtdblock6
+<note tip>You can try to erase the mtd partition before flashing the kernel, but I'm not sure it'd work, and if that's really necessary since __dd__ does a raw copy...</note>
+Shutdown the board. Unplug the uSD card.
+### Second Boot
+Connect your serial adapter, open with these parameters: __115200 8n1__ without any flow control.
+Restart the board.__Interrupt the boot process in uBoot by pressing Enter__. It should drop you to a uBoot shell. Enter theses lines
+    setenv nandargs "setenv bootargs mem=460M ubi.mtd=7 root=/dev/mmcblk0p2 console=ttyS0,115200n8 console=tty0 mtdparts=WMT.nand:10m(kernel),-(rootfs)"
+    setenv nandboot "nandrw r 0x0 0x1000000 0x400000;  if iminfo 0x1000000; then run nandargs; bootm 0x1000000; fi"
+then
+    boot
+When the Kernel starts booting, insert the uSD card so it can find the rootfs. When the system is ready, you should be able to connect using SSH. Login: __root__, password: __apricot__. Use the physical screen and keyboard to find out the IP address
+From now it's pretty much the same as the original HowTo. Format the mtd7 partition (the __rootfs__)
+    mount /dev/mmcblk0p1 /mnt
+    dpkg -i /mnt/mtd-utils_1.5.0-1_armhf.deb
+    umount /mnt
+    ubidetach -d 0
+    ubiformat /dev/mtd7
+    ubiattach -p /dev/mtd7
+    ubimkvol /dev/ubi0 -m -N rootfs
+    mount -t ubifs ubi0:rootfs /mnt
+Debootstrap Time ! It ccan be quite long, so... once you've seen it's start correctly, go do something else, have a coffe, take a (short) nap, ...
+    apt-get install -y debootstrap
+    debootstrap --no-check-gpg wheezy /chroot http://mirrordirector.raspbian.org/raspbian/
+Once it's done, you can chroot in your new system !
+    mount -t proc none /mnt/proc
+    mount -t sysfs none /mnt/sys
+    mount -o bind /dev /mnt/dev
+    chroot /mnt
+You should now be using the rootfs on NAND, time to setup the Raspbian distro
+    mount /dev/mmcblk0p1 /mnt
+    cp -R /mnt/modKern/modules /lib/
+    depmod
+Install uBoot tools to be able to change the uBoot parameters if/when you need
+    apt-get install u-boot-tools
+    echo "/dev/mtd3 0x0000 0x10000 0x10000" > /etc/fw_env.config
+    echo "/dev/mtd4 0x0000 0x10000 0x10000" >> /etc/fw_env.config
+    fw_printenv ## Should print the uBoot env
+Make the previous setenv changes permanent:
+    fw_setenv nandargs "setenv bootargs mem=460M ubi.mtd=7 root=ubi0:rootfs rootfstype=ubifs console=ttyS0,115200n8 console=tty0 mtdparts=WMT.nand:10m(kernel),-(rootfs)"
+    fw_setenv nandboot "nandrw r 0x0 0x1000000 0x400000;  if iminfo 0x1000000; then run nandargs; bootm 0x1000000; fi"
+Setup you debian installation
+    passwd
+    echo "proc /proc proc defaults 0 0" >> /etc/fstab
+    echo "ubi0:rootfs / ubifs defaults 0 0" >> /etc/fstab
+    echo "" >> /etc/network/interfaces
+    echo "allow-hotplug eth0" >> /etc/network/interfaces
+    echo "iface eth0 inet dhcp" >> /etc/network/interfaces
+Install the SSH server
+    apt-get update
+    apt-get install openssh-server tmux
+Edit the inittab to enable a serial session, just in case...
+    nano /etc/inittab
+That should be it, you can safely poweroff the board, unplug the uSD card, then reboot.
+### That's all folks !
+Well, you now have a working Debian Wheezy system. I haven't tested all the graphic part, since it's running as server under my desk, but it should work fine...
+## Troubleshooting
+__The board doesn't start ?__ Even with Firmware 1.2, it seems the board sometimes needs a screen attached to complete the boot process and connect to the network...