[U-Boot] [PATCH 1/3] OMAP3/4/5/AM33xx: Correct logic for checking FAT or RAW MMC

[Tom Rini]

In the case of booting from certain peripherals, such as UART, we must
not see what the device descriptor says for RAW or FAT mode because in
addition to being nonsensical, it leads to a hang.  This is why we have
a test currently for the boot mode being within range.  The problem
however is that on some platforms we get MMC2_2 as the boot mode and not
the defined value for MMC2, and in others we get the value for MMC2_2.
This is required to fix eMMC booting on omap5_uevm.

Tested on am335x_evm (UART, NAND, SD), omap3_beagle (NAND, SD on
classic, SD only on xM rev C5) and omap5_uevm (SD, eMMC).

Signed-off-by: Tom Rini <trini at ti.com>
---
 arch/arm/cpu/armv7/omap-common/lowlevel_init.S |   10 +++++++---
 arch/arm/include/asm/arch-am33xx/spl.h         |    3 +++
 arch/arm/include/asm/arch-omap3/spl.h          |    3 +++
 arch/arm/include/asm/arch-omap4/spl.h          |    2 ++
 arch/arm/include/asm/arch-omap5/spl.h          |    2 ++
 5 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/arch/arm/cpu/armv7/omap-common/lowlevel_init.S b/arch/arm/cpu/armv7/omap-common/lowlevel_init.S
index b933fe8..90b3c8a 100644
--- a/arch/arm/cpu/armv7/omap-common/lowlevel_init.S
+++ b/arch/arm/cpu/armv7/omap-common/lowlevel_init.S
@@ -60,10 +60,14 @@ ENTRY(save_boot_params)
 	ldr	r3, =boot_params
 	strb	r2, [r3, #BOOT_DEVICE_OFFSET]	@ spl_boot_device <- r1
 
-	/* boot mode is passed only for devices that can raw/fat mode */
-	cmp	r2, #BOOT_DEVICE_XIP
+	/*
+	 * boot mode is only valid for device that can be raw or FAT booted.
+	 * in other cases it may be fatal to look.  While platforms differ
+	 * in the values used for each MMC slot, they are contiguous.
+	 */
+	cmp	r2, #MMC_BOOT_DEVICES_START
 	blt	2f
-	cmp	r2, #BOOT_DEVICE_MMC2
+	cmp	r2, #MMC_BOOT_DEVICES_END
 	bgt	2f
 	/* Store the boot mode (raw/FAT) in omap_bootmode */
 	ldr	r2, [r0, #DEV_DESC_PTR_OFFSET]	@ get the device descriptor ptr
diff --git a/arch/arm/include/asm/arch-am33xx/spl.h b/arch/arm/include/asm/arch-am33xx/spl.h
index f60b086..14a2c7c 100644
--- a/arch/arm/include/asm/arch-am33xx/spl.h
+++ b/arch/arm/include/asm/arch-am33xx/spl.h
@@ -37,4 +37,7 @@
 #define BOOT_DEVICE_USBETH	68
 #define BOOT_DEVICE_CPGMAC	70
 #define BOOT_DEVICE_MMC2_2      0xFF
+
+#define MMC_BOOT_DEVICES_START	BOOT_DEVICE_MMC1
+#define MMC_BOOT_DEVICES_END	BOOT_DEVICE_MMC2
 #endif
diff --git a/arch/arm/include/asm/arch-omap3/spl.h b/arch/arm/include/asm/arch-omap3/spl.h
index dec4dac..84e6d7b 100644
--- a/arch/arm/include/asm/arch-omap3/spl.h
+++ b/arch/arm/include/asm/arch-omap3/spl.h
@@ -31,4 +31,7 @@
 #define BOOT_DEVICE_MMC1	6
 #define BOOT_DEVICE_XIPWAIT	7
 #define BOOT_DEVICE_MMC2_2      0xFF
+
+#define MMC_BOOT_DEVICES_START	BOOT_DEVICE_MMC2
+#define MMC_BOOT_DEVICES_END	BOOT_DEVICE_MMC1
 #endif
diff --git a/arch/arm/include/asm/arch-omap4/spl.h b/arch/arm/include/asm/arch-omap4/spl.h
index 4e094f9..f61627f 100644
--- a/arch/arm/include/asm/arch-omap4/spl.h
+++ b/arch/arm/include/asm/arch-omap4/spl.h
@@ -32,4 +32,6 @@
 #define BOOT_DEVICE_MMC2	6
 #define BOOT_DEVICE_MMC2_2	0xFF
 
+#define MMC_BOOT_DEVICES_START	BOOT_DEVICE_MMC1
+#define MMC_BOOT_DEVICES_END	BOOT_DEVICE_MMC2
 #endif
diff --git a/arch/arm/include/asm/arch-omap5/spl.h b/arch/arm/include/asm/arch-omap5/spl.h
index 323cd63..d4d353c 100644
--- a/arch/arm/include/asm/arch-omap5/spl.h
+++ b/arch/arm/include/asm/arch-omap5/spl.h
@@ -32,4 +32,6 @@
 #define BOOT_DEVICE_MMC2        6
 #define BOOT_DEVICE_MMC2_2	7
 
+#define MMC_BOOT_DEVICES_START	BOOT_DEVICE_MMC1
+#define MMC_BOOT_DEVICES_END	BOOT_DEVICE_MMC2_2
 #endif
-- 
1.7.9.5