Allwinner SoCs provide uart0 muxed with mmc0, which can then be used with a micro SD breakout board. On the A23, this is the only way to use uart0.
Signed-off-by: Chen-Yu Tsai wens@csie.org --- arch/arm/cpu/armv7/sunxi/board.c | 11 ++++++++++- include/configs/sunxi-common.h | 2 ++ 2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/arch/arm/cpu/armv7/sunxi/board.c b/arch/arm/cpu/armv7/sunxi/board.c index b6d63db..29d45b6 100644 --- a/arch/arm/cpu/armv7/sunxi/board.c +++ b/arch/arm/cpu/armv7/sunxi/board.c @@ -50,7 +50,16 @@ u32 spl_boot_mode(void)
int gpio_init(void) { -#if CONFIG_CONS_INDEX == 1 && (defined(CONFIG_SUN4I) || defined(CONFIG_SUN7I)) +#if CONFIG_CONS_INDEX == 1 && defined(CONFIG_UART0_PORT_F) +#if defined(CONFIG_SUN4I) || defined(CONFIG_SUN7I) + /* disable GPB22,23 as uart0 tx,rx to avoid conflict */ + sunxi_gpio_set_cfgpin(SUNXI_GPB(22), SUNXI_GPIO_INPUT); + sunxi_gpio_set_cfgpin(SUNXI_GPB(23), SUNXI_GPIO_INPUT); +#endif + sunxi_gpio_set_cfgpin(SUNXI_GPF(2), SUNXI_GPF2_UART0_TX); + sunxi_gpio_set_cfgpin(SUNXI_GPF(4), SUNXI_GPF4_UART0_RX); + sunxi_gpio_set_pull(SUNXI_GPF(4), 1); +#elif CONFIG_CONS_INDEX == 1 && (defined(CONFIG_SUN4I) || defined(CONFIG_SUN7I)) sunxi_gpio_set_cfgpin(SUNXI_GPB(22), SUN4I_GPB22_UART0_TX); sunxi_gpio_set_cfgpin(SUNXI_GPB(23), SUN4I_GPB23_UART0_RX); sunxi_gpio_set_pull(SUNXI_GPB(23), SUNXI_GPIO_PULL_UP); diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h index 7571e0e..7857a56 100644 --- a/include/configs/sunxi-common.h +++ b/include/configs/sunxi-common.h @@ -77,6 +77,7 @@ #define CONFIG_INITRD_TAG
/* mmc config */ +#if !defined(CONFIG_UART0_PORT_F) #define CONFIG_MMC #define CONFIG_GENERIC_MMC #define CONFIG_CMD_MMC @@ -84,6 +85,7 @@ #define CONFIG_MMC_SUNXI_SLOT 0 #define CONFIG_ENV_IS_IN_MMC #define CONFIG_SYS_MMC_ENV_DEV 0 /* first detected MMC controller */ +#endif
/* 4MB of malloc() pool */ #define CONFIG_SYS_MALLOC_LEN (CONFIG_ENV_SIZE + (4 << 20))