rockchip: Drop first 32kb of zeros from the rkSD image type

Instead of creating a rockchip SPL SD card image with 32KB of zeros which can be written to the start of an SD card, create the images with only the useful data that should be written to an offset of 32KB on the SD card. The first 32 kilobytes aren't needed for bootup and only serve as convenient way of accidentally obliterating your partition table. Signed-off-by: Sjoerd Simons <[email protected]> Acked-by: Simon Glass <[email protected]> Signed-off-by: Simon Glass <[email protected]>
imaami · Sep 3, 2015 · dd39bca · dd39bca
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commit dd39bca
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Showing 2 changed files with 3 additions and 8 deletions.
diff --git a/doc/README.rockchip b/doc/README.rockchip
@@ -90,7 +90,7 @@ Booting from an SD card
 To write an image that boots from an SD card (assumed to be /dev/sdc):
 
    ./firefly-rk3288/tools/mkimage -T rksd -d firefly-rk3288/spl/u-boot-spl-dtb.bin out
-   sudo dd if=out of=/dev/sdc
+   sudo dd if=out of=/dev/sdc seek=64
    sudo dd if=firefly-rk3288/u-boot-dtb.img of=/dev/sdc seek=256
 
 This puts the Rockchip header and SPL image first and then places the U-Boot

diff --git a/tools/rksd.c b/tools/rksd.c
@@ -14,9 +14,7 @@
 #include "rkcommon.h"
 
 enum {
-	RKSD_HEADER0_START	= 64 * RK_BLK_SIZE,
-	RKSD_SPL_HDR_START	= RKSD_HEADER0_START +
-					RK_CODE1_OFFSET * RK_BLK_SIZE,
+	RKSD_SPL_HDR_START	= RK_CODE1_OFFSET * RK_BLK_SIZE,
 	RKSD_SPL_START		= RKSD_SPL_HDR_START + 4,
 	RKSD_HEADER_LEN		= RKSD_SPL_START,
 };
@@ -44,11 +42,8 @@ static void rksd_set_header(void *buf,  struct stat *sbuf,  int ifd,
 	unsigned int size;
 	int ret;
 
-	/* Zero the whole header. The first 32KB is empty */
-	memset(buf,  '\0',  RKSD_HEADER0_START);
-
 	size = params->file_size - RKSD_SPL_HDR_START;
-	ret = rkcommon_set_header(buf + RKSD_HEADER0_START, size);
+	ret = rkcommon_set_header(buf, size);
 	if (ret) {
 		/* TODO([email protected]): This method should return an error */
 		printf("Warning: SPL image is too large (size %#x) and will not boot\n",