[U-Boot] [PATCH v3] image: Fix Android boot image support

[Ahmad Draidi]

This patch makes the following changes:
- Set kernel entry point correctly
- Append bootargs from image to global bootargs instead
        of replacing them
- Return end address instead of size from android_image_get_end()
- Give correct parameter to genimg_get_format() in boot_get_ramdisk()
- Move ramdisk message printing from android_image_get_kernel() to
	android_image_get_ramdisk()

Signed-off-by: Ahmad Draidi <ar2000jp at gmail.com>
Cc: Tom Rini <trini at ti.com>
---
Changes for v2:
   - Cleanup bootargs copying code
   - Coding Style cleanup
Changes for v3:
   - In android_image_get_kernel(), return -ENOMEM instead of -1
	on malloc() failure
   - Move ramdisk message printing from android_image_get_kernel()
	to android_image_get_ramdisk()
   - Add android_image_get_kernel() documentation comment
---
 common/bootm.c         |  4 +--
 common/image-android.c | 68 +++++++++++++++++++++++++++++++++++++++-----------
 common/image.c         |  3 ++-
 3 files changed, 57 insertions(+), 18 deletions(-)

diff --git a/common/bootm.c b/common/bootm.c
index ff81a27..c04a3b0 100644
--- a/common/bootm.c
+++ b/common/bootm.c
@@ -144,11 +144,11 @@ static int bootm_find_os(cmd_tbl_t *cmdtp, int flag, int argc,
 		images.os.type = IH_TYPE_KERNEL;
 		images.os.comp = IH_COMP_NONE;
 		images.os.os = IH_OS_LINUX;
-		images.ep = images.os.load;
-		ep_found = true;
 
 		images.os.end = android_image_get_end(os_hdr);
 		images.os.load = android_image_get_kload(os_hdr);
+		images.ep = images.os.load;
+		ep_found = true;
 		break;
 #endif
 	default:
diff --git a/common/image-android.c b/common/image-android.c
index 6ded7e2..59079fc 100644
--- a/common/image-android.c
+++ b/common/image-android.c
@@ -7,9 +7,26 @@
 #include <common.h>
 #include <image.h>
 #include <android_image.h>
+#include <malloc.h>
+#include <errno.h>
 
 static char andr_tmp_str[ANDR_BOOT_ARGS_SIZE + 1];
 
+/**
+ * android_image_get_kernel() - processes kernel part of Android boot images
+ * @hdr:	Pointer to image header, which is at the start
+ *			of the image.
+ * @verify:	Checksum verification flag. Currently unimplemented.
+ * @os_data:	Pointer to a ulong variable, will hold os data start
+ *			address.
+ * @os_len:	Pointer to a ulong variable, will hold os data length.
+ *
+ * This function returns the os image's start address and length. Also,
+ * it appends the kernel command line to the bootargs env variable.
+ *
+ * Return: Zero, os start address and length on success,
+ *		otherwise on failure.
+ */
 int android_image_get_kernel(const struct andr_img_hdr *hdr, int verify,
 			     ulong *os_data, ulong *os_len)
 {
@@ -25,16 +42,32 @@ int android_image_get_kernel(const struct andr_img_hdr *hdr, int verify,
 
 	printf("Kernel load addr 0x%08x size %u KiB\n",
 	       hdr->kernel_addr, DIV_ROUND_UP(hdr->kernel_size, 1024));
-	strncpy(andr_tmp_str, hdr->cmdline, ANDR_BOOT_ARGS_SIZE);
-	andr_tmp_str[ANDR_BOOT_ARGS_SIZE] = '\0';
-	if (strlen(andr_tmp_str)) {
-		printf("Kernel command line: %s\n", andr_tmp_str);
-		setenv("bootargs", andr_tmp_str);
+
+	int len = 0;
+	if (*hdr->cmdline) {
+		printf("Kernel command line: %s\n", hdr->cmdline);
+		len += strlen(hdr->cmdline);
+	}
+
+	char *bootargs = getenv("bootargs");
+	if (bootargs)
+		len += strlen(bootargs);
+
+	char *newbootargs = malloc(len + 2);
+	if (!newbootargs) {
+		puts("Error: malloc in android_image_get_kernel failed!\n");
+		return -ENOMEM;
+	}
+	*newbootargs = '\0';
+
+	if (bootargs) {
+		strcpy(newbootargs, bootargs);
+		strcat(newbootargs, " ");
 	}
-	if (hdr->ramdisk_size)
-		printf("RAM disk load addr 0x%08x size %u KiB\n",
-		       hdr->ramdisk_addr,
-		       DIV_ROUND_UP(hdr->ramdisk_size, 1024));
+	if (*hdr->cmdline)
+		strcat(newbootargs, hdr->cmdline);
+
+	setenv("bootargs", newbootargs);
 
 	if (os_data) {
 		*os_data = (ulong)hdr;
@@ -52,17 +85,18 @@ int android_image_check_header(const struct andr_img_hdr *hdr)
 
 ulong android_image_get_end(const struct andr_img_hdr *hdr)
 {
-	u32 size = 0;
+	ulong end;
 	/*
 	 * The header takes a full page, the remaining components are aligned
 	 * on page boundary
 	 */
-	size += hdr->page_size;
-	size += ALIGN(hdr->kernel_size, hdr->page_size);
-	size += ALIGN(hdr->ramdisk_size, hdr->page_size);
-	size += ALIGN(hdr->second_size, hdr->page_size);
+	end = (ulong)hdr;
+	end += hdr->page_size;
+	end += ALIGN(hdr->kernel_size, hdr->page_size);
+	end += ALIGN(hdr->ramdisk_size, hdr->page_size);
+	end += ALIGN(hdr->second_size, hdr->page_size);
 
-	return size;
+	return end;
 }
 
 ulong android_image_get_kload(const struct andr_img_hdr *hdr)
@@ -75,6 +109,10 @@ int android_image_get_ramdisk(const struct andr_img_hdr *hdr,
 {
 	if (!hdr->ramdisk_size)
 		return -1;
+
+	printf("RAM disk load addr 0x%08x size %u KiB\n",
+	       hdr->ramdisk_addr, DIV_ROUND_UP(hdr->ramdisk_size, 1024));
+
 	*rd_data = (unsigned long)hdr;
 	*rd_data += hdr->page_size;
 	*rd_data += ALIGN(hdr->kernel_size, hdr->page_size);
diff --git a/common/image.c b/common/image.c
index 085771c..e21c848 100644
--- a/common/image.c
+++ b/common/image.c
@@ -1009,7 +1009,8 @@ int boot_get_ramdisk(int argc, char * const argv[], bootm_headers_t *images,
 		image_multi_getimg(images->legacy_hdr_os, 1, &rd_data, &rd_len);
 	}
 #ifdef CONFIG_ANDROID_BOOT_IMAGE
-	else if ((genimg_get_format(images) == IMAGE_FORMAT_ANDROID) &&
+	else if ((genimg_get_format((void *)images->os.start)
+			== IMAGE_FORMAT_ANDROID) &&
 		 (!android_image_get_ramdisk((void *)images->os.start,
 		 &rd_data, &rd_len))) {
 		/* empty */
-- 
2.1.1