BRG_UART_CLK
#define BRG_UART_CLK_DIV16 (BRG_UART_CLK/16)
if (((BRG_UART_CLK / rate) - 1) < 4096)
out_be32(bp, (((BRG_UART_CLK / rate) - 1) << 1) | CPM_BRG_EN);