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). Thank you.
