Hi! On Tue, Jan 9, 2024 at 6:52 PM John Crispin <j...@phrozen.org> wrote: > [...] > FAQ > > * Why are there are 2 different flash chips? > - the idea is to make the device (almost!) unbrickable and very easy to > recover
What about a built-in JTAG probe instead of SPI-NOR+USB-UART? It'll be actually unbrickable instead. > - NAND will hold the main loader (U-Boot) and the Linux image and will > be the default boot device > - NOR will be write-protected by default (with WP jumper available on > the board) and will hold a recovery bootloader (and other essential > data, like Wi-Fi calibration) > - a dedicated boot select switch will allow changing between NOR and NAND > [...] > * What is the purpose of the console USB-C port? > - Holtek UART to USB bridge with CDC-ACM support on USB-C makes the > device ultra easy to communicate with. No extra hardware or drivers will > be required. Android for example has CDC-ACM support enabled by default There are several MCU-based CMSIS-DAP projects out there. They can provide a CDC-ACM serial with a JTAG interface. It may be a bit slow if a USB1.1 MCU is picked, but it should be enough to start a bootloader to unbrick the device. Here's one with USB2.0 Hi-speed interface: https://github.com/cherry-embedded/CherryDAP The Sipeed M0S module used costs 20CNY on Taobao (or 2.81 USD according to google) -- Regards, Chuanhong Guo _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
