diff options
| -rw-r--r-- | sys/arm/freescale/imx/imx6_machdep.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/sys/arm/freescale/imx/imx6_machdep.c b/sys/arm/freescale/imx/imx6_machdep.c index 9f738a5..26c7110 100644 --- a/sys/arm/freescale/imx/imx6_machdep.c +++ b/sys/arm/freescale/imx/imx6_machdep.c @@ -190,3 +190,27 @@ u_int imx_soc_type() return (IMXSOC_6Q); } +/* + * Early putc routine for EARLY_PRINTF support. To use, add to kernel config: + * option SOCDEV_PA=0x02000000 + * option SOCDEV_VA=0x02000000 + * option EARLY_PRINTF + * Resist the temptation to change the #if 0 to #ifdef EARLY_PRINTF here. It + * makes sense now, but if multiple SOCs do that it will make early_putc another + * duplicate symbol to be eliminated on the path to a generic kernel. + */ +#if 0 +static void +imx6_early_putc(int c) +{ + volatile uint32_t * UART_STAT_REG = (uint32_t *)0x02020098; + volatile uint32_t * UART_TX_REG = (uint32_t *)0x02020040; + const uint32_t UART_TXRDY = (1 << 3); + + while ((*UART_STAT_REG & UART_TXRDY) == 0) + continue; + *UART_TX_REG = c; +} +early_putc_t *early_putc = imx6_early_putc; +#endif + |
