Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
arch/arm/mach-imx/boot.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/arch/arm/mach-imx/boot.c b/arch/arm/mach-imx/boot.c
index 7c59c2181..e2696a934 100644
--- a/arch/arm/mach-imx/boot.c
+++ b/arch/arm/mach-imx/boot.c
@@ -303,6 +303,19 @@ void imx6_get_boot_source(enum bootsource *src, int *instance)
#define IMX7_SRC_SBMR1 0x58
#define IMX7_SRC_SBMR2 0x70
+#define IMX_BOOT_SW_INFO_POINTER_ADDR 0x000001E8
+#define IMX_BOOT_SW_INFO_BDT_SD 0x1
+
+struct imx_boot_sw_info {
+ uint8_t reserved_1;
+ uint8_t boot_device_instance;
+ uint8_t boot_device_type;
+ uint8_t reserved_2;
+ uint32_t frequency_hz[4]; /* Various frequencies (ARM, AXI,
+ * DDR, etc.). Not used */
+ uint32_t reserved_3[3];
+} __packed;
+
void imx7_get_boot_source(enum bootsource *src, int *instance)
{
void __iomem *src_base = IOMEM(MX7_SRC_BASE_ADDR);
@@ -313,6 +326,33 @@ void imx7_get_boot_source(enum bootsource *src, int *instance)
return;
if (imx6_bootsource_serial(sbmr2)) {
+ /*
+ * On i.MX7 ROM code will try to bood from uSDHC1
+ * before entering serial mode. It doesn't seem to be
+ * reflected in the contents of SBMR1 in any way when
+ * that happens, so we check "Boot_SW_Info" structure
+ * (per 6.6.14 Boot information for software) to see
+ * if that really happened.
+ *
+ * FIXME: This behaviour can be inhibited by
+ * DISABLE_SDMMC_MFG, but location of that fuse
+ * doesn't seem to be documented anywhere. Once that
+ * is known it should be taken into account here.
+ */
+ const struct imx_boot_sw_info *info;
+
+ info = (const void *)readl(IMX_BOOT_SW_INFO_POINTER_ADDR);
+
+ if (info->boot_device_type == IMX_BOOT_SW_INFO_BDT_SD) {
+ *src = BOOTSOURCE_MMC;
+ /*
+ * We are expecting to only ever boot from
+ * uSDHC1 here
+ */
+ WARN_ON(*instance = info->boot_device_instance);
+ return;
+ }
+
*src = BOOTSOURCE_SERIAL;
return;
}
--
2.14.3
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