From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matwey V. Kornilov <matwey.kornilov@gmail.com>
Date: Mon, 12 Oct 2020 11:39:34 +0300
Subject: am335x uart boot
Message-ID: <rm14o7$v44$1@ciao.gmane.io>
List-Id: <u-boot.lists.denx.de>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: u-boot@lists.denx.de

Hello,

I am trying to provide u-boot via uart to am335x bootrom (I use
BeagleBone Black board). Has anyone succeeded on it?

The CPU technical reference says that I have to use X-Modem 1K to load
the firmware. I am trying to reach this with screen and sx command.

In the serial console I see transmission invitation from the hardware
side: 'C'.
When I use sx --1k -X to transmit the binary there are no data accepted.
When I use sx -X (with 128 byte frame) the transmission is running until
hardware sends "Cancel" command in the middle.

I've also tried minicom terminal. It behaves like X-Modem 128 byte
transmission with no success.