got everything working at 1.5Mbaud (woohoo!!)
diff --git a/bbb_cape/src/cape/uart_common.c b/bbb_cape/src/cape/uart_common.c
index 7b05102..3b8cd9a 100644
--- a/bbb_cape/src/cape/uart_common.c
+++ b/bbb_cape/src/cape/uart_common.c
@@ -11,7 +11,7 @@
void uart_common_configure(int baud) {
gpio_setup_alt(GPIOA, 9, 7);
gpio_setup_alt(GPIOA, 10, 7);
- //GPIOA->OSPEEDR |= GPIO_OSPEEDER_OSPEEDR9; // we want to go FAST!
+ GPIOA->OSPEEDR |= GPIO_OSPEEDER_OSPEEDR9; // we want to go FAST!
RCC->APB2ENR |= RCC_APB2ENR_UARTEN;
// baud = 60MHz / kMultiplier * (whole_part + fraction / kMultiplier))