Joel Stanley <joel <at> jms.id.au> writes:

+/ {
+	model = "AST2500 EVB";
+	compatible = "aspeed,ast2500";
+
+	chosen {
+		stdout-path = &uart5;
+		bootargs = "console=ttyS4,115200";
+	};
+
+	memory {
+		reg = < 0x80000000 0x10000000 >;

The AST2500 EVB has an SK Hynix H5AN4G6NMFR 4Gb part, so this should be 
0x20000000 for size.

+			uart1: serial <at> 1e783000 {
+				compatible = "ns16550a";
+				reg = <0x1e783000 0x1000>;
+				reg-shift = <2>;
+				interrupts = <9>;
+				clock-frequency = <1843200>;

The AST2500 datasheet 39.3.1 states the input clock to their 16550 IP is 
24 MHz. Their u-boot code also has #define CONFIG_SYS_NS16550_CLK 
24000000. I suspect we hit a path in the serial/8250 driver that doesn't 
change the divisor from what u-boot set, which is why this has worked.

Thanks for the porting work!

cheers
//xo