From: Jaehoon Chung <jh80.chung@samsung.com>
Date: Thu, 9 Feb 2017 10:06:39 +0000 (+0900)
Subject: samsung: platform_boot: add ramdisk booting about autoboot
X-Git-Tag: submit/tizen/20170220.031841~1
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a60c99ea4e9c37825ab3926d1bd10a5ce4640b79;p=platform%2Fkernel%2Fu-boot.git

samsung: platform_boot: add ramdisk booting about autoboot

If it needs to boot from ramdisk, root device must be /dev/ram0.
But current root device is hard-coding as /dev/mmcblk0p2.

When there is ramdisk image, set to root=/dev/ram0.
Otherwise maintain the current root device(root=/dev/mmcblk0p2).

After this patch, tizen can use the raw ramdisk image without any
converting.

This patch is also maintaining backward compatibility about not using
ramdisk.

Change-Id: I5463cfc8067cfe2f7c591ba689269c8d8ea51a0c
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
---

diff --git a/include/configs/odroid_xu3.h b/include/configs/odroid_xu3.h
index 5d8d65f127..7df97d44da 100644
--- a/include/configs/odroid_xu3.h
+++ b/include/configs/odroid_xu3.h
@@ -102,6 +102,7 @@
 	"zImage fat 0 1;"                   \
 	"Image.itb fat 0 1;"                \
 	"uInitrd fat 0 1;"                  \
+	"ramdisk.img fat 0 1;"		    \
 	"boot.scr fat 0 1;"                 \
 	"boot.cmd fat 0 1;"                 \
 	"exynos5422-odroidxu3.dtb fat 0 1;" \
diff --git a/include/samsung/platform_boot.h b/include/samsung/platform_boot.h
index 17ec079693..996b80c856 100644
--- a/include/samsung/platform_boot.h
+++ b/include/samsung/platform_boot.h
@@ -23,16 +23,27 @@
 #define PLATFORM_BOOT_INFO \
 	"initrdname=uInitrd\0" \
 	"initrdaddr=42000000\0" \
+	"initrdsize=800000\0" \
 	"fdtaddr=40800000\0" \
+	"root_dev=/dev/mmcblk${mmcrootdev}p${mmcrootpart}\0" \
+	"root_device=setenv root_dev /dev/mmcblk${mmcrootdev}p${mmcrootpart}\0" \
 	"loadkernel=load mmc ${mmcbootdev}:${mmcbootpart} ${kerneladdr} " \
 		"${kernelname}\0" \
-	"loadinitrd=load mmc ${mmcbootdev}:${mmcbootpart} ${initrdaddr} " \
-		"${initrdname}\0" \
+	"loadinitrd=" \
+		"if test -e mmc ${mmcbootdev}:${mmcbootpart} ramdisk.img; then " \
+			"setenv initrdname ramdisk.img;" \
+			"load mmc ${mmcbootdev}:${mmcbootpart} ${initrdaddr} " \
+			"${initrdname};" \
+		"else " \
+			"load mmc ${mmcbootdev}:${mmcbootpart} ${initrdaddr} " \
+			"${initrdname};" \
+		"fi;\0" \
 	"loaddtb=load mmc ${mmcbootdev}:${mmcbootpart} ${fdtaddr} " \
 		"${fdtfile}\0" \
 	"check_ramdisk=" \
 		"if run loadinitrd; then " \
-			"setenv initrd_addr ${initrdaddr};" \
+			"setenv initrd_addr ${initrdaddr}:${initrdsize}; " \
+			"setenv root_dev /dev/ram0 rw;" \
 		"else " \
 			"setenv initrd_addr -;" \
 		"fi;\0" \
@@ -43,7 +54,7 @@
 			"setenv fdt_addr;" \
 		"fi;\0" \
 	"kernel_args=" \
-		"setenv bootargs root=/dev/mmcblk${mmcrootdev}p${mmcrootpart}" \
+		"setenv bootargs root=${root_dev}" \
 		" rootfstype=${rootfstype} rootwait ${console} ${opts}\0" \
 	"boot_fit=" \
 		"setenv kerneladdr 0x42000000;" \
@@ -69,6 +80,7 @@
 		"bootz ${kerneladdr} ${initrd_addr} ${fdt_addr};\0" \
 	"autoboot=" \
 		"run checkboard;" \
+		"run root_device;" \
 		"if test -e mmc 0:${mmcbootpart} Image.itb; then; " \
 			"run boot_fit;" \
 		"elif test -e mmc 0:${mmcbootpart} zImage; then; " \