Lup Yuen Lee 李立源 @lupyuen@qoto.org

From Now On: We shall read and understand the AliOS / RivieraWaves Source Code ... While comparing it with the Decompiled Code for #BL602 libwifi ... Just to be sure that they are the same 🤝

https://github.com/lupyuen/AliOS-Things/tree/master/platform/mcu/bk7231u/beken/ip/ke

"Linux for riscv32?"

https://www.reddit.com/r/RISCV/comments/o8vvuy/linux_for_riscv32/?utm_medium=android_app&utm_source=share

AliOS for Beken BK7231U WiFi SoC contains LMAC Firmware Code ... Is this the same LMAC Firmware that runs on #BL602's #WiFi Radio? 🤔 Super Exciting!

https://github.com/lupyuen/AliOS-Things/tree/master/platform/mcu/bk7231u/beken/ip/lmac/src

The AliOS / RivieraWaves code we saw earlier was for Beken BK7231U WiFi + BLE SoC ... Is it related to #BL602? 🤔

http://www.bekencorp.com/en/goods/detail/cid/13.html

Lesson Learnt: GitHub Search is our very good friend for Reverse Engineering! 👍

https://github.com/search?l=C&o=asc&q=ke_evt_schedule&s=indexed&type=Code

Now the #BL602 #WiFi Stack gets clearer ... We're actually reading the WiFi Driver Code by CEVA RivieraWaves! 💡

https://www.ceva-dsp.com/product/rivierawaves-wi-fi-platforms/

But does "ke_evt_schedule" really come from AliOS? Not quite ... "ke_evt_schedule" actually comes from ... CEVA RivieraWaves! 😲

https://github.com/mclown/AliOS-Things/blob/master/platform/mcu/bk7231u/beken/ip/ke/ke_event.c#L203-L231

#BL602 "wifi_main" calls "ke_evt_schedule" to do #WiFi Tasks ... GitHub Search shows that "ke_evt_schedule" is also defined in ... AliOS! 😲

https://github.com/lupyuen/bl602nutcracker1/blob/main/bl602_demo_wifi.c#L28721-L28737

"wifi_main" lives in the mysterious #BL602 #WiFi Library "libwifi" ... Let's study the decompiled C code (thanks to BraveHeartFLOSSDev and Ghidra)

https://github.com/lupyuen/bl602nutcracker1/blob/main/bl602_demo_wifi.c#L32959-L33006

#BL602 Firmware starts the #WiFi Stack ... By creating a Background Task that runs wifi_main ... Let's hunt for wifi_main

https://github.com/lupyuen/bl_iot_sdk/blob/master/customer_app/bl602_demo_wifi/bl602_demo_wifi/main.c#L729-L747

Moving away from LMAC Firmware (since we got no code) ... Let's study the mysterious #BL602 #WiFi Library "libwifi" ... Which has been decompiled into C by BraveHeartFLOSSDev

https://github.com/BraveHeartFLOSSDev/bl602nutcracker1

#LoRa Messenger in a Nokia shell (STM32H7)

https://hackaday.com/2021/06/26/lora-messenger-in-nokias-shell/

"Why Did We Ever Think the First Programming Language Didn't Matter?"

https://m-cacm.acm.org/blogs/blog-cacm/253393-why-did-we-ever-think-the-first-programming-language-didnt-matter/fulltext

"Alternatives to SEGGER RTT and SystemView?"

https://www.reddit.com/r/embedded/comments/o8bn3o/alternatives_to_segger_rtt_and_systemview/?utm_medium=android_app&utm_source=share

#Windows 11 May Spark Scalping for TPM2.0 Chips, a Requirement To Run the OS

https://sea.pcmag.com/windows-10/44465/windows-11-may-spark-scalping-for-tpm20-chips-a-requirement-to-run-the-os

User Inyerface - A worst-practice UI experiment

https://userinyerface.com/

GNU/Linux on Tablets: Hardware (#PineTab)

https://linmob.net/gnu-linux-on-tablets-hardware/

Cooking Mee Goreng / Malaysian Style Fried Noodles

https://youtu.be/FnHW8RlhqpQ

But 0x4400 0000 is NOT documented in #BL602 Reference Manual! 😲 Now we know a secret ... BL602 talks to LMAC Firmware at Address 0x4400 0000 🤫

https://github.com/bouffalolab/bl_docs/blob/main/BL602_RM/en/BL602_BL604_RM_1.2_en.pdf

#BL602 #WiFi Driver triggers LMAC Interrupt ... By writing to Address 0x4400 0000 ... Let's see what's at 0x4400 0000

https://github.com/lupyuen/bl_iot_sdk/blob/master/components/bl602/bl602_wifidrv/bl60x_wifi_driver/reg_ipc_app.h#L66-L69