ipq40xx: add support for Aruba AP-365

ipq40xx: add support for Aruba AP-365

Hardware
--------
SoC:   Qualcomm IPQ4029
RAM:   512M DDR3
FLASH: - 128MB NAND (Macronix MX30LF1G18AC)
       - 4MB SPI-NOR (Macronix MX25R3235F)
TPM:   Atmel AT97SC3203
BLE:   Texas Instruments CC2540T
       attached to ttyMSM0
ETH:   Atheros AR8035
LED:   System (red / green / amber)
BTN:   Reset

The USB port on the device is (in contrast to other Aruba boards) real
USB. The AP uses a CP2101 USB TTY converter on the board.

Console baudrate is 9600 8n1.

To enable a full list of commands in the U-Boot "help" command, execute
the literal "diag" command.

Installation
------------

1. Get the OpenWrt initramfs image. Rename it to ipq40xx.ari and put it
   into the TFTP server root directory. Configure the TFTP server to
   be reachable at 192.168.1.75/24. Connect the machine running the TFTP
   server to the ethernet port of the access point.

2. Connect to the serial console. Interrupt autobooting by pressing
   Enter when prompted.

3. Configure the bootargs and bootcmd for OpenWrt.
   $ setenv bootargs_openwrt "setenv bootargs console=ttyMSM1,9600n8"
   $ setenv nandboot_openwrt "run bootargs_openwrt; ubi part aos1;
     ubi read 0x85000000 kernel; bootm 0x85000000"
   $ setenv ramboot_openwrt "run bootargs_openwrt;
     setenv ipaddr 192.168.1.105; setenv serverip 192.168.1.75;
     netget; set fdt_high 0x87000000; bootm"
   $ setenv bootcmd "run nandboot_openwrt"
   $ saveenv

4. Load OpenWrt into RAM:
   $ run ramboot_openwrt

5. After OpenWrt booted, transfer the OpenWrt sysupgrade image to the
   /tmp folder on the device.

6. Flash OpenWrt:
   Make sure you use the mtd partition with the label "ubi" here!

   $ ubidetach -p /dev/mtd1
   $ ubiformat /dev/mtd1
   $ sysupgrade -n /tmp/openwrt-sysupgrade.bin

To go back to the stock firmware, simply reset the bootcmd in the
bootloader to the original value:

  $ setenv bootcmd "boot"
  $ saveenv

Signed-off-by: David Bauer <mail@david-bauer.net>