Hello everybody,
I am now working on the BD-SL-i.MX6.
I need to use the GPIO_19 PAD for another use than KEY_VOLUME_DOWN and that is why I changed the IOMUX config of this pad in the kernel (arch/arm/mach-mx6/pads-mx6_sabrelite.h).
Since then Android start on Safe Mode and I haven't since yet something useful in the logcat. Moreover, according to the Android Compatibility Definition for ICS/4.0.4, VOLUME DOWN key is not mandatory.
So I decided to move the VOLUME DOWN function to another GPIO on another PAD. I chose :
| MX6PAD(EIM_A24__GPIO_5_4), | /* GPIO5[4] - unused */ |
And in arch/arm/mach-mx6/board-mx6q_sabrelite.c I've done :
-#define MX6_SABRELITE_VOL_DOWN_KEY IMX_GPIO_NR(4, 5)
+//#define MX6_SABRELITE_VOL_DOWN_KEY IMX_GPIO_NR(4, 5)
+#define MX6_SABRELITE_VOL_DOWN_KEY IMX_GPIO_NR(5, 4)
Eventually there is a need for PAD control in arch/arm/plat-mxc/include/mach/iomux-mx6q.h (although for the original GPIO_19 there is no control) :
+#define MX6Q_EIM_24_PAD_CTRL PAD_CTL_PUS_47K_UP
| #define MX6Q_PAD_EIM_A24__GPIO_5_4 | \ |
| - | (_MX6Q_PAD_EIM_A24__GPIO_5_4 | MUX_PAD_CTRL(NO_PAD_CTRL)) |
| + | (_MX6Q_PAD_EIM_A24__GPIO_5_4 | MUX_PAD_CTRL(MX6Q_EIM_24_PAD_CTRL) |
Then Android STILL boot in Safe Mode.
I wonder how Android can be aware that the VOLUME_DOWN is linked on another PADS...
I looked into U-boot configuration and I changed : board/boundary/nitrogen6x/nitrogen6x.c
@@ -228,7 +228,8 @@ static iomux_v3_cfg_t const button_pads[] = {
/* Home */
MX6_PAD_NANDF_D4__GPIO_2_4 | MUX_PAD_CTRL(BUTTON_PAD_CTRL),
/* Volume Down */
- MX6_PAD_GPIO_19__GPIO_4_5 | MUX_PAD_CTRL(BUTTON_PAD_CTRL),
+// MX6_PAD_GPIO_19__GPIO_4_5 | MUX_PAD_CTRL(BUTTON_PAD_CTRL),
+ MX6_PAD_EIM_A24__GPIO_5_4 | MUX_PAD_CTRL(BUTTON_PAD_CTRL),
But still Safe Mode.
So I looked up in /proc/cmdline but U-boot give nothing to the kernel about GPIO-keys
I am quite lost about in which case Android boot into safeMode by itself and how Android "knows" that I changed the IOMUX-ing.m
I hope I was enough clear about the problem I am encountering,
Thanks
Jerome Olivier
