121 lines
4.1 KiB
Markdown
121 lines
4.1 KiB
Markdown
# Flash Tool for Aruba AP-105
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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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## Prepare
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Requirements:
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- RaspberryPi
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- Programming clip SOIC16/SOP16 and cabling
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- [Raspbian](https://www.raspberrypi.com/software/)
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- [enabled SPI interface](https://codingworld.io/spi-aktivieren-am-raspberry-pi/)
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- [`flashrom`](https://www.flashrom.org/Flashrom) tool
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Configure SPI on the RaspberryPi:
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```
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sudo raspi-config
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# Select Interfacing Options
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# Select SPI
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# Select Yes
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# Select Ok
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# Leave with finish or ESC
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```
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To install `flashrom`:
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```
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sudo apt-get install flashrom
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```
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Connect the AP105 Flash chip. The red status LED on AP105 must glow
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```
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*-------------------------------------*
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| ------|MX25L12835------ |
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| *-----|1 HOLD#/SIO3 CLK 16 |---|----*
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| *-----|2 VCC SI/SIO0 15 |---* |
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| | |3 RESET# | |
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| | |4 | |
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| | |5 | |
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| | |6 | |
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| | *--|7 CS# GND 10 |------* |
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| *-|-----|8 SO/SIO1 WP#/SIO2 |-* | |
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| | | | ----------------------- | | |
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| | | | | | |
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| | *-------------------------------* | |
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| | | *-------------------------------* | |
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| | | | | |
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| | | --------|RaspberryPi|------- | | |
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| | | | 1 2| | | |
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| | | | 3 4| | | |
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| | | | 5 6| | | |
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| | | | 7 8| | | |
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| | | | 9 10| | | |
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| | | |11 12| | | |
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| | | |13 14| | | |
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| | | |15 16| | | |
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| | *---|17 +3V3 18| | | |
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| *-----|19 MOSI/GPIO 20| | | |
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*-------|21 MISO/GPIO 22| | | |
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*-----|23 SCLK/GPIO GPIO 8/CE0# 24|-* | |
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| *---|25 GND 26| | |
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| | |27 28| | |
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| | |29 30| | |
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| | |31 32| | |
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| | |33 34| | |
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| | |35 36| | |
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| | |37 38| | |
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| | |39 40| | |
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| | ---------------------------- | |
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| *------------------------------------* |
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*----------------------------------------*
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```
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## Usage
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```
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ap105-flash <SERIAL NUMBER>
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```
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The flash will be secured into files:
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- `AP105-<SERIAL NUMBER>-dump0.rom`
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- `AP105-<SERIAL NUMBER>-dump1.rom`
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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.
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After a confirmation the patched file will be flashed to the device.
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## Known problems
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### Chip isn't detected by flashrom
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- Check the wiring
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- Ensure the RaspberryPi have enough power like a power supply with 5V/2A
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- Ensure the red LED is illuminated on the AP105
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- Reduce the SPI speed to 1000 kHz (default 16500 kHz)
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```
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SPEED=1000 ap105-flash <SERIAL NUMBER>
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```
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### flashrom fails during erase
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- Check power supply
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- Reduce the SPI speed like described above
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## Sources
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- [git repository for uboot loader @chunkey](https://github.com/chunkeey/u-boot-ap105/releases)
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- [OpenWRT device page](https://openwrt.org/toh/aruba/ap-105)
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- [Datasheet MX25L12835](https://pdf1.alldatasheet.com/datasheet-pdf/view/575542/MCNIX/MX25L12835E.html)
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- [RaspberryPi ASCII Art](http://weyprecht.de/2015/11/30/raspberry-pi-ascii-art/)
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- [flashrom page for RaspberryPi](https://www.flashrom.org/RaspberryPi)
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