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The GEM ethernet on SiFive unleashed has fixed input clock of 125MHz as-per SiFive FU540 manual. This patch updates FDT generation for QEMU sifive_u machine to provide fixed-rate clock for GEM ethernet. Signed-off-by: Anup Patel <anup@brainfault.org> Signed-off-by: Anup Patel <anup.patel@wdc.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Palmer Dabbelt <palmer@sifive.com> Signed-off-by: Palmer Dabbelt <palmer@sifive.com>