From: theom+news@chiark.greenend.org.uk   
      
   druck  wrote:   
   > On 27/03/2025 15:53, Theo wrote:   
   > > druck  wrote:   
   > >> It may still work on the Pi 2B, but being slower you may need to   
   > >> increase the value of rootwait in cmdline.txt - particularly if it is a   
   > >> spinning disc rather than an SSD - it could take 60 seconds before the   
   > >> drive is readable.   
   > >   
   > > I think the problem here is that start.elf, config.txt, the kernel and   
   > > cmdline.txt are all on the USB device - you can't put a timeout in   
   > > cmdline.txt because by that point you already need the USB device up to   
   read   
   > > that file.   
   > >   
   > > The alternative approach would be to have a regular bootcode.bin,   
   start.elf,   
   > > kernel, etc on the SD card and then tell the kernel to find its rootfs on a   
   > > USB drive, at which point rootwait may help.  (I think Bob is using FreeBSD   
   > > but there is probably an equivalent option there).  Or to interpose u-boot   
   > > for the 'kernel' on the SD card, and then tell u-boot to find the kernel on   
   > > USB.   
   >   
   > That's the only way it works on older devices.   
      
   Supposedly you can make them USB boot by just providing a bootcode.bin on   
   SD, then they pick up start.elf, config.txt etc from USB.  I've not tried   
   this, but it appears to work for some people.   
      
   (previously bootcode.bin didn't know anything about USB, but since Pi 3/4/5   
   can USB boot I believe that code has now made itself into bootcode.bin)   
      
   Theo   
      
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