Lup Yuen Lee 李立源 @lupyuen@qoto.org

#BL602 Firmware Flasher works like a State Machine ... Each Flashing State triggers a Flashing Command ... Let's trace the Flashing States

https://github.com/bouffalolab/BLOpenFlasher/blob/main/utils/util_program.go#L195-L245

You can't tell which way the train went by looking at the tracks ... So let's study the #BL602 Firmware Flasher ... And see what Flashing Commands it sends to the EFlash Loader

https://github.com/bouffalolab/BLOpenFlasher

So cute that the #BL602 Flashing Commands are all ASCII ... Perfect for UART! 👍

https://github.com/lupyuen/bl602-eflash-loader#flashing-commands

Here are the 24 Flashing Commands supported by the #BL602 EFlash Loader ... Thanks to Ghidra 🎉

https://github.com/lupyuen/bl602-eflash-loader#flashing-commands

#Ghidra reveals the 24 Flashing Commands supported by #BL602 EFlash Loader ... Very nice! 👍

https://github.com/lupyuen/bl602-eflash-loader

#Ghidra says that #BL602 EFlash Loader supports 24 Flashing Commands ... Let's decipher them 🤔

https://github.com/lupyuen/bl602-eflash-loader

Call Graph for #BL602 EFlash Loader ... Generated by #Ghidra

https://github.com/lupyuen/bl602-eflash-loader

What are the Flash Commands executed by the #BL602 EFlash Loader? 🤔

https://github.com/lupyuen/bl602-eflash-loader/blob/main/eflash_loader.c#L3814-L3844

Here's the #BL602 EFlash Loader's Main Loop that executes Flashing Commands

https://github.com/lupyuen/bl602-eflash-loader/blob/main/eflash_loader.c#L4031-L4108

#BL602 EFlash Loader's Main Function is surprisingly readable ... Decompiled from ELF by Ghidra

https://github.com/lupyuen/bl602-eflash-loader/blob/main/eflash_loader.c#L2803-L2863

More about #BL602 EFlash Loader

https://lupyuen.github.io/articles/flash#flash-the-firmware

Decompiled #BL602 EFlash Loader is here ... 10,000 lines of C to skim for goodies 👍

https://github.com/lupyuen/bl602-eflash-loader/blob/main/eflash_loader.c

EFlash Loader is the program that runs on #BL602 to flash all firmware ... The ELF was uploaded recently (no source available) ... Let's look inside with Ghidra

https://github.com/bouffalolab/bl_iot_sdk/tree/master/flash_tool/chips/bl602/eflash_loader

Decompiled the new #BL602 EFlash Loader with #Ghidra 🤔

https://github.com/bouffalolab/bl_iot_sdk/blob/master/flash_tool/chips/bl602/eflash_loader/eflash_loader.elf

Which means we'll have to patch blflash too 🤔

https://github.com/spacemeowx2/blflash/issues/9

#BL602 will have new Embedded Flash ... Get ready to update our dev tools 👍

https://gist.github.com/lupyuen/2cb2034a436dc75acc1aeb63ea3b9aa1#file-bl602-new-emdedded-flash-md

With Auto Flash & Test: No more worries about merging hundreds of Upstream Commits (and thousands of changed files) into our #NuttX Repo! 👍

https://lupyuen.github.io/articles/auto?22#merge-updates-from-nuttx

RESET and GPIO 8 on #BL602 ... Extreme Close-Up

https://lupyuen.github.io/articles/auto?30#connect-bl602-to-single-board-computer

Here's how I sync my #BL602 Articles with Upstream #NuttX

https://lupyuen.github.io/articles/auto?21#merge-updates-from-nuttx

Keeping my #BL602 Articles in sync with #NuttX Upstream looks complicated ... But I'll explain everything ☂️

https://lupyuen.github.io/articles/auto?20#merge-updates-from-nuttx