More information:
On Angstrom:
root@beaglebone:~# cat /proc/tty/driver/OMAP-SERIAL
serinfo:1.0 driver revision:
0: uart:OMAP UART0 mmio:0x44E09000 irq:72 tx:86855 rx:459 RTS|CTS|DTR|DSR
1: uart:OMAP UART1 mmio:0x48022000 irq:73 tx:0 rx:0 CTS|DSR|CD|RI
2: uart:OMAP UART2 mmio:0x48024000 irq:74 tx:0 rx:0 CTS|DSR
3: uart:OMAP UART3 mmio:0x481A6000 irq:44 tx:0 rx:0 CTS|DSR
4: uart:OMAP UART4 mmio:0x481A8000 irq:45 tx:0 rx:0 CTS|DSR
5: uart:OMAP UART5 mmio:0x481AA000 irq:46 tx:0 rx:0 CTS|DSR
Then on the yocto build:
serinfo:1.0 driver revision:
0: uart:OMAP UART0 mmio:0x44E09000 irq:88 tx:4452 rx:285 RTS|CTS|DTR|DSR