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authorPetr Kulhavy <brain@jikos.cz>2016-09-09 10:27:16 +0200
committerTom Rini <trini@konsulko.com>2016-10-01 20:04:51 -0400
commitb6dd69a4d6b20862a2075f402f9edfb0de6d14ed (patch)
treecde16c70cc63077087cdfb209d812a1d7a5980b8 /doc
parent87b8530fe24408b0ef41c9b80f38c395ccafad2c (diff)
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fastboot: add support for writing MBR
Add special target "mbr" (otherwise configurable via CONFIG_FASTBOOT_MBR_NAME) to write MBR partition table. Partitions are now searched using the generic function which finds any partiiton by name. For MBR the partition names hda1, sda1, etc. are used. Signed-off-by: Petr Kulhavy <brain@jikos.cz> Reviewed-by: Tom Rini <trini@konsulko.com> Acked-by: Steve Rae <steve.rae@raedomain.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'doc')
-rw-r--r--doc/README.android-fastboot37
1 files changed, 37 insertions, 0 deletions
diff --git a/doc/README.android-fastboot b/doc/README.android-fastboot
index ce12bc5..dea7066 100644
--- a/doc/README.android-fastboot
+++ b/doc/README.android-fastboot
@@ -59,6 +59,43 @@ To define a partition alias add an environment variable similar to:
fastboot_partition_alias_<alias partition name>=<actual partition name>
Example: fastboot_partition_alias_boot=LNX
+Partition Names
+===============
+The Fastboot implementation in U-boot allows to write images into disk
+partitions (currently on eMMC). Target partitions are referred on the host
+computer by their names.
+
+For GPT/EFI the respective partition name is used.
+
+For MBR the partitions are referred by generic names according to the
+following schema:
+
+ <device type> <device index letter> <partition index>
+
+Example: hda3, sdb1, usbda1
+
+The device type is as follows:
+
+ * IDE, ATAPI and SATA disks: hd
+ * SCSI disks: sd
+ * USB media: usbd
+ * Disk on chip: docd
+ * other: xx
+
+The device index starts from 'a' and refers to the interface (e.g. USB
+controller, SD/MMC controller) or disk index. The partition index starts
+from 1 and describes the partition number on the particular device.
+
+Writing Partition Table
+=======================
+Fastboot also allows to write the partition table to the media. This can be
+done by writing the respective partition table image to a special target
+"gpt" or "mbr". These names can be customized by defining the following
+configuration options:
+
+CONFIG_FASTBOOT_GPT_NAME
+CONFIG_FASTBOOT_MBR_NAME
+
In Action
=========
Enter into fastboot by executing the fastboot command in u-boot and you