From: Carlo Caione carlo@endlessm.com
The GRF_SOC_CON0.grf_force_jtag bit is automatically set at boot and it is preventing the SDMMC to work correctly. Disable the JTAG function on the assumption that a working SD has higher priority over JTAG.
Signed-off-by: Carlo Caione carlo@endlessm.com Reviewed-by: Simon Glass sjg@chromium.org --- arch/arm/mach-rockchip/rk3288-board.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/arch/arm/mach-rockchip/rk3288-board.c b/arch/arm/mach-rockchip/rk3288-board.c index 0365793009..bf24d8e074 100644 --- a/arch/arm/mach-rockchip/rk3288-board.c +++ b/arch/arm/mach-rockchip/rk3288-board.c @@ -307,6 +307,7 @@ U_BOOT_CMD( "" );
+#define GRF_SOC_CON0 0xff770244 #define GRF_SOC_CON2 0xff77024c
int board_early_init_f(void) @@ -339,5 +340,11 @@ int board_early_init_f(void) } rk_setreg(GRF_SOC_CON2, 1 << 0);
+ /* + * Disable JTAG on sdmmc0 IO. The SDMMC won't work until this bit is + * cleared + */ + rk_clrreg(GRF_SOC_CON0, 1 << 12); + return 0; }