Fwd: fat: handle Windows formatted partition (thru USB Mass Storage)

[Andy Shevchenko]

---------- Forwarded message ---------
From: Andy Shevchenko <andy.shevchenko at gmail.com>
Date: Mon, Jan 13, 2020 at 12:52 PM
Subject: fat: handle Windows formatted partition (thru USB Mass Storage)
To: AKASHI Takahiro <takahiro.akashi at linaro.org>, Heinrich Schuchardt
<xypron.glpk at gmx.de>
Cc: Tom Rini <trini at konsulko.com>, U-Boot Mailing List
<u-boot at lists.denx.de>, Simon Glass <sjg at chromium.org>, Bin Meng
<bmeng.cn at gmail.com>


Hi!

I recently stumble over FAT partitioning issue. I have a device with
MMC, one partition of which has been exported as disk via USB Mass
Storage to the host. When Windows 10 sees that disk it can't handle it
till I format it there. So far so good. However, the same partition
can't be used under U-Boot due to Windows flow, i.e. it makes a
partitioning on top of the actual partition while U-Boot expects that
we only have one MBR (or partitioning) on the dist. So, the commands
such fatls, fatload do not recognise any file there.

In Linux it's easy to use: mount -o loop,offset=65536 /dev/mmcblk0p9 /mnt
(offset can be different)

But I would like to use it in U-Boot.

Any thoughts on this?

-- 
With Best Regards,
Andy Shevchenko