spl: change return values of spl_*_load_image()

Make spl_*_load_image() functions return a value instead of
hanging if a problem is encountered. This enables main spl code
to make the decision whether to hang or not, thus preparing
it to support alternative boot devices.

Some boot devices (namely nand and spi) do not hang on error.
Instead, they return normally and SPL proceeds to boot the
contents of the load address. This is considered a bug and
is rectified by hanging on error for these devices as well.

Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Tom Rini <trini@konsulko.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Ian Campbell <ijc@hellion.org.uk>
Cc: Hans De Goede <hdegoede@redhat.com>
Cc: Albert Aribaud <albert.u.boot@aribaud.net>
Cc: Jagan Teki <jteki@openedev.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 12 insertions, 5 deletions

diff --git a/drivers/mtd/spi/spi_spl_load.c b/drivers/mtd/spi/spi_spl_load.c
index 2e0c871219..ca56fe9015 100644
--- a/drivers/mtd/spi/spi_spl_load.c
+++ b/drivers/mtd/spi/spi_spl_load.c
@@ -12,6 +12,7 @@
 #include <common.h>
 #include <spi.h>
 #include <spi_flash.h>
+#include <errno.h>
 #include <spl.h>
 
 #ifdef CONFIG_SPL_OS_BOOT
@@ -48,8 +49,9 @@ static int spi_load_image_os(struct spi_flash *flash,
  * configured and available since this code loads the main U-Boot image
  * from SPI into SDRAM and starts it from there.
  */
-void spl_spi_load_image(void)
+int spl_spi_load_image(void)
 {
+	int err = 0;
 	struct spi_flash *flash;
 	struct image_header *header;
 
@@ -63,7 +65,7 @@ void spl_spi_load_image(void)
 				CONFIG_SF_DEFAULT_MODE);
 	if (!flash) {
 		puts("SPI probe failed.\n");
-		hang();
+		return -ENODEV;
 	}
 
 	/* use CONFIG_SYS_TEXT_BASE as temporary storage area */
@@ -74,10 +76,15 @@ void spl_spi_load_image(void)
 #endif
 	{
 		/* Load u-boot, mkimage header is 64 bytes. */
-		spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS, 0x40,
-			       (void *)header);
+		err = spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS, 0x40,
+				     (void *)header);
+		if (err)
+			return err;
+
 		spl_parse_image_header(header);
-		spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
+		err = spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
 			       spl_image.size, (void *)spl_image.load_addr);
 	}
+
+	return err;
 }