dev_tree: Do not update Android fstab by default

For Linux OS, this has no use.

For custom Android OS, the developers are used to make changes
on the source files directly, rather than relying on this logic.

Additionally, the changes that it make are most likely deprecated
on newer Android versions or newer kernel versions.

Stock Android OS may rely on it though, but the purpose of lk2nd
is likely never used to be booting stock Android OS...

Change-Id: Ia0f331dc60c7d2c023c0d79e531e801bc6193d55

Author: me-cafebabe

lk2nd/project/base.mk

@@ -66,6 +66,9 @@ DEFINES += GENERATE_CMDLINE_ONLY_FOR_ANDROID=1
 # Disable reading splash partition to avoid crashes on some devices
 DEFINES += DISABLE_SPLASH_PARTITION=1
 
+# Disable updating Android fstab devicetree node
+DEFINES += SKIP_UPDATE_ANDROID_FSTAB=1
+
 # Enable "fastboot oem help" for a list of supported fastboot commands
 DEFINES += FASTBOOT_HELP=1
 

makefile

@@ -134,6 +134,10 @@ ifeq ($(DYNAMIC_PARTITION_SUPPORT),1)
   DEFINES += DYNAMIC_PARTITION_SUPPORT=1
 endif
 
+ifeq ($(SKIP_UPDATE_ANDROID_FSTAB),1)
+  DEFINES += SKIP_UPDATE_ANDROID_FSTAB=1
+endif
+
 ifeq ($(TARGET_DTBO_NOT_SUPPORTED),1)
   DEFINES += TARGET_DTBO_NOT_SUPPORTED=1
 endif

platform/msm_shared/dev_tree.c

@@ -75,7 +75,7 @@ struct dt_entry_v1
 	uint32_t size;
 };
 
-#if ENABLE_BOOTDEVICE_MOUNT || DYNAMIC_PARTITION_SUPPORT
+#if !SKIP_UPDATE_ANDROID_FSTAB && (ENABLE_BOOTDEVICE_MOUNT || DYNAMIC_PARTITION_SUPPORT)
 /* Look up table for fstab node */
 struct fstab_node
 {
@@ -2334,7 +2334,7 @@ int update_device_tree(void *fdt, const char *cmdline, enum boot_type boot_type,
 		}
 	}
 
-#if ENABLE_BOOTDEVICE_MOUNT || DYNAMIC_PARTITION_SUPPORT
+#if !SKIP_UPDATE_ANDROID_FSTAB && (ENABLE_BOOTDEVICE_MOUNT || DYNAMIC_PARTITION_SUPPORT)
 	/* Update fstab node */
 	dprintf(SPEW, "Start of fstab node update:%zu ms\n", platform_get_sclk_count());
 	if (update_fstab_node(fdt) != 0) {
@@ -2357,7 +2357,7 @@ int update_device_tree(void *fdt, const char *cmdline, enum boot_type boot_type,
 	return ret;
 }
 
-#if ENABLE_BOOTDEVICE_MOUNT || DYNAMIC_PARTITION_SUPPORT
+#if !SKIP_UPDATE_ANDROID_FSTAB && (ENABLE_BOOTDEVICE_MOUNT || DYNAMIC_PARTITION_SUPPORT)
 /*Update device tree for fstab node */
 static int update_fstab_node(void *fdt)
 {