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Raspberry Pi 3B (32 Bit) Bare Metal Wifi Driver

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rpi-3b-wifi

Raspberry Pi 3B (32 Bit) Bare Metal Wifi Driver

This is an attempt to write bare metal wifi driver for raspberry pi by following Plan9 code.

Build Process

  • Get docker desktop for your host operating system
  • Change directory to rpi-3b-wifi
  • Invoke ./build.sh
  • Find binary in current working directory.
  • IMAGE directory has all the files which can be directly copied to sd card of PI to test this code.

Current Status : Wifi driver NOT WORKING

Development Plan

  • Set up basic utilities like printf, timers, interrupt
  • Use emmec controller to read sd card's contents
  • Add sdhost driver to read sd card's content
  • Remove EMMC dependency to read sd card
  • Write basic SDIO driver for EMMC
  • Use emmc + sdio to enable wifi
  • Get broadcom binary driver for wifi chip
  • Load broadcom driver into wifi chip
  • Join network with no security
  • Join network with wpa2/psk security
  • Initialize wifi
  • Send packets
  • Use light wight network library to use wifi
  • Write basic http hello world test example using wifi

make DISABLE_EXP=1 to disable experimental

  • Troubleshooting

Prefetch exception handler from dwelch67/mmu prints last value of R0 = 0000A1E0 DFSR= 000008A7 => [2:0] = 0b111 => translation fault page from manual. IFSR= 00001629 lr = 00008700 instruction = E92D4010 => e92d4010 push {r4, lr} 00008040

dump of data abort exception 00022680 00000001 00001629 00010584 E1D400B7 00022220 Last Ro value, DFSR, IFSR, LR, instruction, i don't know this

Last Ro value DFSR IFSR LR instruction Unkwown
00022680 00000001 00001629 00010584 E1D400B7 00022220

Format source code using:

make format

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Raspberry Pi 3B (32 Bit) Bare Metal Wifi Driver

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