Bring-up with Netconsole and USB without a Serial Debug Net
summary
Shows bootloader-plus-host tools that bring a board up with no UART or JTAG: use the AM335x ROM to present USB-as-Ethernet, TFTP u-boot into RAM, run u-boot’s netconsole over USB for interactive commands, then TFTP kernel and ramdisk. Uses Buildroot and a Node.js host stack (node-beagle-boot) to serve ARP/BOOTP/TFTP and capture logs; demo on PocketBeagle flashes unique serials in ~2–3s and successfully boots Linux over USB. Current limits: kernel early printk is flaky because configfs is late and leaving netconsole live can crash u-boot; EFI-based Bootloader to kernel via EFI is proposed.
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chapters (26)
- 0:00Introduction
- 2:37How many of you have used Netconsole
- 3:31JTAG
- 6:01Netconsole
- 8:19ARP
- 10:50Ethernet over USB
- 15:18USB gadget concepts
- 16:53Why did you want to do this
- 20:17NodeUSB
- 24:36Goals for NodeUSB
- 27:36What can you do in USB
- 29:42Where to get the code
- 30:36Is this going to work
- 34:41SPI
- 35:23USB
- 36:13Memory
- 37:43TFTP
- 38:17Bootloader
- 38:31Bringup
- 38:52Hardware testing
- 40:01SOC support
- 40:53UART over USB
- 42:33Hardware Serial
- 43:28USB Serial
- 44:12USB Debug Net
- 47:12Next Steps
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