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[v1] doc: README.distro: Special case with Windows formatted disk

Message ID 20200117104451.62417-1-andriy.shevchenko@linux.intel.com
State New
Delegated to: Tom Rini
Headers show
Series [v1] doc: README.distro: Special case with Windows formatted disk | expand

Commit Message

Andy Shevchenko Jan. 17, 2020, 10:44 a.m. UTC
If someone wants to use shared (by installed OS) eMMC partition to
the Windows to boot from, it's not possible due to U-Boot limitations.

Describe this case and possible workaround.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 doc/README.distro | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
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Patch

diff --git a/doc/README.distro b/doc/README.distro
index ab6e6f4e74..807a82c910 100644
--- a/doc/README.distro
+++ b/doc/README.distro
@@ -405,3 +405,23 @@  of the boot environment and are not guaranteed to exist or work in the same
 way in future u-boot versions.  In particular the <device type>_boot
 variables (e.g. mmc_boot, usb_boot) are a strictly internal implementation
 detail and must not be used as a public interface.
+
+Using a eMMC partition that has been formatted as a disk by Windows 10
+======================================================================
+
+Let's assume we have an (embedded) board with U-Boot and Linux OS
+installed on eMMC. Linux OS shares one of the eMMC partitions as
+a disk via USB Mass Storage protocol.
+
+It may be useful to utilize that disk to copy bootable files from
+Windows machine to the board in case someone doesn't want to erase
+stock installation on it.
+
+Unfortunately, Windows 10 doesn't provide knobs and always formats
+that disk as a whole, meaning that it creates a partition table on it
+with requested (FAT) partition. As a result U-Boot may not see any
+files on it due to nesting partition tables.
+
+The workaround may be in formatting the partition under Linux OS,
+setting up a network connection between Linux OS and Windows 10 and
+use it to copy files to the partition.