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Add support for setting the TFTP block size. The default value (1468) is fine for Ethernet and allows a better throughput than the TFTP default (512), if the server supports the blksize option of course. I tested this change with qemu_arm64_lwip_defconfig. The throughput is now 875 KiB/s vs. 313 KiB/s before. That is still a low number, but I think we can't expect more without implementing the windowsize option. Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>