HelenOS sources

AM335x_UART0_IRQ  202 kernel/arch/arm32/src/mach/beaglebone/beaglebone.c 	    AM335x_UART0_IRQ, AM335x_UART0_BASE_ADDRESS,
AM335x_UART0_IRQ  218 kernel/arch/arm32/src/mach/beaglebone/beaglebone.c 		omap_irc_enable(bbone.irc_addr, AM335x_UART0_IRQ);
HelenOS homepage, sources at GitHub