imx: Introduce CONFIG_SPL_FORCE_MMC_BOOT to force MMC boot on falcon mode
This change tries to fix the following problem:
- The board boots (to be more precise - ROM loads SPL) from a slow SPI-NOR
memory.
As a result the spl_boot_device() will return SPI-NOR as a boot device
(which is correct).
- The problem is that in 'falcon boot' the eMMC is used as a boot medium to
load kernel from its partition.
Calling spl_boot_device() will break things as it returns SPI-NOR device.
To fix this issue the new CONFIG_SPL_FORCE_MMC_BOOT Kconfig flag is
introduced to handle this special use case. By default it is not defined,
so there is no change in the legacy code flow.
Signed-off-by: Lukasz Majewski <lukma@denx.de>
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 2ca2199..f59b6f5 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -608,6 +608,15 @@
this option to build the drivers in drivers/mmc as part of an SPL
build.
+config SPL_FORCE_MMC_BOOT
+ bool "Force SPL booting from MMC"
+ depends on SPL_MMC_SUPPORT
+ default n
+ help
+ Force SPL to use MMC device for Linux kernel booting even when the
+ SoC ROM recognized boot medium is not eMMC/SD. This is crucial for
+ factory or 'falcon mode' booting.
+
config SPL_MMC_TINY
bool "Tiny MMC framework in SPL"
depends on SPL_MMC_SUPPORT