From: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
This handler updates the non-active MMC boot partition and after a
successful update makes the updated partition the active one. This way
the machine should continue to be bootable when the update fails.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
---
arch/arm/mach-imx/imx-bbu-internal.c | 76 ++++++++++++++++++++++++++++++++++++
1 file changed, 76 insertions(+)
diff --git a/arch/arm/mach-imx/imx-bbu-internal.c b/arch/arm/mach-imx/imx-bbu-internal.c
index 254ccb6369e6..e34638713151 100644
--- a/arch/arm/mach-imx/imx-bbu-internal.c
+++ b/arch/arm/mach-imx/imx-bbu-internal.c
@@ -29,6 +29,7 @@
#include <linux/mtd/mtd-abi.h>
#include <linux/stat.h>
#include <ioctl.h>
+#include <environment.h>
#include <mach/bbu.h>
#define FLASH_HEADER_OFFSET_MMC 0x400
@@ -369,6 +370,59 @@ static int imx_bbu_internal_v2_update(struct bbu_handler *handler, struct bbu_da
return ret;
}
+static int imx_bbu_internal_v2_mmcboot_update(struct bbu_handler *handler,
+ struct bbu_data *data)
+{
+ struct imx_internal_bbu_handler *imx_handler =
+ container_of(handler, struct imx_internal_bbu_handler, handler);
+ int ret;
+ uint32_t *barker;
+ char *bootpartvar;
+ const char *bootpart;
+ char *devicefile;
+
+ barker = data->image + imx_handler->flash_header_offset;
+
+ if (*barker != IVT_BARKER) {
+ printf("Board does not provide DCD data and this image is no imximage\n");
+ return -EINVAL;
+ }
+
+ ret = asprintf(&bootpartvar, "%s.boot", data->devicefile);
+ if (ret < 0)
+ return ret;
+
+ bootpart = getenv(bootpartvar);
+
+ if (!strcmp(bootpart, "boot0")) {
+ bootpart = "boot1";
+ } else {
+ bootpart = "boot0";
+ }
+
+ ret = asprintf(&devicefile, "/dev/%s.%s", data->devicefile, bootpart);
+ if (ret < 0)
+ goto free_bootpartvar;
+
+ ret = imx_bbu_check_prereq(devicefile, data);
+ if (ret)
+ goto free_devicefile;
+
+ ret = imx_bbu_write_device(imx_handler, devicefile, data, data->image, data->len);
+
+ if (!ret)
+ /* on success switch boot source */
+ ret = setenv(bootpartvar, bootpart);
+
+free_devicefile:
+ free(devicefile);
+
+free_bootpartvar:
+ free(bootpartvar);
+
+ return ret;
+}
+
static int imx_bbu_external_update(struct bbu_handler *handler, struct bbu_data *data)
{
struct imx_internal_bbu_handler *imx_handler =
@@ -498,6 +552,28 @@ int imx6_bbu_internal_mmc_register_handler(const char *name, char *devicefile,
return __register_handler(imx_handler);
}
+/*
+ * Register a handler that writes to the non-active boot partition of an mmc
+ * medium and on success activates the written-to partition. So the machine can
+ * still boot even after a failed try to write a boot image.
+ *
+ * Pass "devicefile" without partition name and /dev/ prefix. e.g. just "mmc2".
+ * Note that no further partitioning of the boot partition is supported up to
+ * now.
+ */
+int imx6_bbu_internal_mmcboot_register_handler(const char *name, char *devicefile,
+ unsigned long flags)
+{
+ struct imx_internal_bbu_handler *imx_handler;
+
+ imx_handler = __init_handler(name, devicefile, flags);
+ imx_handler->flash_header_offset = FLASH_HEADER_OFFSET_MMC;
+
+ imx_handler->handler.handler = imx_bbu_internal_v2_mmcboot_update;
+
+ return __register_handler(imx_handler);
+}
+
/*
* Register a i.MX53 internal boot update handler for i2c/spi
* EEPROMs / flashes. Nearly the same as MMC/SD, but we do not need to
--
2.14.2
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