Hi Matteo, > TFTP downloads in U-Boot >= 2025.07 on Raspberry Pi 4 Model B Revision 1.5 > stall during transfer (continuous T output), while the same setup works > correctly with U-Boot 2025.04. > > Please note that U-Boot starts correctly, DHCP works, and small TFTP still > works, but large TFTP stalls (e.g., kernel or initramfs files). > > On the contrary, Raspberry Pi 4 Model B Revision 1.4 does not have the > stall issue and can download files correctly up to the latest stable > version of U-Boot (2026.04).
As far as I can tell from PCN [1] the only difference is the dual RAM chips so I'm not sure what difference there may be and I only have rev 1.1 and 1.4 of the 4B. Any chance you could do a git bisect between 2025.04 and 2025.07 to work out what change causes the issue? Peter [1] https://pip.raspberrypi.com/categories/560-pcn
