Hi Tim, I think everybody already cited all main bootloader used with embedded systems.
Maybe the only other suggestion is uMon (http://www.umonfw.com) an old bootloader that still active, but I didn't find port to SAMA5D. It was used mainly with Coldfire MCUs, but was ported to ARM too. BR, Alan On 7/1/23, Tim Hardisty <t...@hardisty.co.uk> wrote: > Not directly related to NuttX but I hope you don't mind me asking here. > > Bottom line: has anyone used any bootloader other than u-boot to allow usb > dfu or RNDIS-type firmware updates, and that easily boot NuttX? > > My board uses the usual SAMA5 methodology of AT91 bootstrap->u-boot->NuttX. > It all works as expected, as far as running code is concerned, but I simply > cannot get u-boot to enable the USB port for DFU or RNDIS functions and I > need the product to have user-friendly in-field updates, ideally without me > having to write any PC update software. > > U-boot has defeated me for over 2 weeks now, and simply refuses to even > "activate" the USB (i.e. a PC never even sees the connect let alone any > functionality: yes, the USB port does work for NuttX and sam-ba code > flashing); device trees are the invention of the devil; and an unholy > apparent mish mash of driver model and "legacy" modes; no SAM boards in the > u-boot trees appearing to have relevant config options I can copy. Add to > that: using latest u-boot rather than the 2020 version I currently have > "working"means it won't even find a console serial port any more, the lack > of response on the relevant AT91 u-boot github to questions, and I am just > about ready to give up :( > > But I need a bootloader! > >
