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Tool to exchange Aruba AP-105 boot loader stored on a MX25L12835 flash chip with uboot for flashing OpenWRT with an RaspberryPi
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Alexander Böhm 8ef0a3ea53 Added flashrom page link 2022-06-10 14:34:53 +02:00
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README.md

Flash Tool for Aruba AP-105

Tool to exchange Aruba AP-105 boot loader stored on a MX25L12835 flash chip with uboot for flashing OpenWRT with an RaspberryPi.

Prepare

Requirements:

Configure SPI on the RaspberryPi:

sudo raspi-config
# Select Interfacing Options
# Select SPI 
# Select Yes
# Select Ok
# Leave with finish or ESC

To install flashrom:

sudo apt-get install flashrom

Connect the AP105 Flash chip. The red status LED on AP105 must glow

        *-------------------------------------*
        |                                     |
        |          ------|MX25L12835------    |
        |         |                       |   |
        |   *-----|1 HOLD#/SIO3    CLK 16 |---|----*
        |   *-----|2 VCC       SI/SIO0 15 |---*    |
        |   |     |3 RESET#               |        |
        |   |     |4                      |        |
        |   |     |5                      |        |
        |   |     |6                      |        |
        |   |  *--|7 CS#           GND 10 |------* |
        | *-|-----|8 SO/SIO1     WP#/SIO2 |-*    | |
        | | |  |   -----------------------  |    | |
        | | |  |                            |    | | 
        | | *-------------------------------*    | |
        | | |  |                                 | |
        | | |  *-------------------------------* | |
        | | |                                  | | |
        | | |    --------|RaspberryPi|-------  | | |
        | | |   | 1                         2| | | |
        | | |   | 3                         4| | | |
        | | |   | 5                         6| | | |
        | | |   | 7                         8| | | |
        | | |   | 9                        10| | | |
        | | |   |11                        12| | | |
        | | |   |13                        14| | | |
        | | |   |15                        16| | | |
        | | *---|17 +3V3                   18| | | |
        | *-----|19 MOSI/GPIO              20| | | |
        *-------|21 MISO/GPIO              22| | | |
          *-----|23 SCLK/GPIO  GPIO 8/CE0# 24|-* | |
          | *---|25 GND                    26|   | |
          | |   |27                        28|   | |
          | |   |29                        30|   | |
          | |   |31                        32|   | |
          | |   |33                        34|   | |
          | |   |35                        36|   | |
          | |   |37                        38|   | |
          | |   |39                        40|   | |
          | |    ----------------------------    | |
          | |                                    | |
          | *------------------------------------* |
          *----------------------------------------*

Usage

ap105-flash <SERIAL NUMBER>

The flash will be secured into files:

  • AP105-<SERIAL NUMBER>-dump0.rom
  • AP105-<SERIAL NUMBER>-dump1.rom

The AP105-<SERIAL_NUMBER>-dump0.rom will be patched with uboot binary uboot.bin and the file AP105-<SERIAL NUMBER>-patch.rom will be created.

After a confirmation the patched file will be flashed to the device.

Known problems

Chip isn't detected by flashrom

  • Check the wiring
  • Ensure the RaspberryPi have enough power like a power supply with 5V/2A
  • Ensure the red LED is illuminated on the AP105
  • Reduce the SPI speed to 1000 kHz (default 16500 kHz)
SPEED=1000 ap105-flash <SERIAL NUMBER>

flashrom fails during erase

  • Check power supply
  • Reduce the SPI speed like described above

Sources