In rk3328, some function pin may have more than one choice, and muxed with more than one IO, for example, the UART2 controller IO, TX and RX, have 3 choice(setting in com_iomux): - M0 which mux with GPIO1A0/GPIO1A1 - M1 which mux with GPIO2A0/GPIO2A1 - usb2phy which mux with USB2.0 DP/DM pin.
This suppose to be set in SPL, but the U-Boot is also design to co-work with Rockchip SPL(miniloader) which may not setting this config, let's set this config to make sure the UART2 TX/RX working in U-Boot.
Signed-off-by: Kever Yang kever.yang@rock-chips.com ---
Changes in v2: - remove SDMMC io routing
board/rockchip/evb_rk3328/evb-rk3328.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/board/rockchip/evb_rk3328/evb-rk3328.c b/board/rockchip/evb_rk3328/evb-rk3328.c index 0a26ed5..823c5da 100644 --- a/board/rockchip/evb_rk3328/evb-rk3328.c +++ b/board/rockchip/evb_rk3328/evb-rk3328.c @@ -5,7 +5,10 @@ */
#include <common.h> +#include <asm/arch/hardware.h> +#include <asm/arch/grf_rk3328.h> #include <asm/armv8/mmu.h> +#include <asm/io.h> #include <dwc3-uboot.h> #include <usb.h>
@@ -13,6 +16,13 @@ DECLARE_GLOBAL_DATA_PTR;
int board_init(void) { +#define GRF_BASE 0xff100000 + struct rk3328_grf_regs * const grf = (void *)GRF_BASE; + + /* uart2 select m1, sdcard select m1*/ + rk_clrsetreg(&grf->com_iomux, IOMUX_SEL_UART2_MASK, + IOMUX_SEL_UART2_M1 << IOMUX_SEL_UART2_SHIFT); + return 0; }