From mboxrd@z Thu Jan 1 00:00:00 1970 From: Cyril Hrubis Date: Mon, 30 Mar 2020 17:21:22 +0200 Subject: [LTP] [PATCH 2/2] device_drivers/uart01: Add uart01 test In-Reply-To: References: <20200327134707.4532-1-chrubis@suse.cz> <20200327134707.4532-3-chrubis@suse.cz> Message-ID: <20200330152122.GA2699@yuki.lan> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ltp@lists.linux.it Hi! > Thank you porting the serialcheck.c into LTP > I am sorry to find the serialcheck have not LOOPBACK mode support > the LOOPBACK mode is a better test than HW flow , because most machine's > uart have not connect the Rx & TX > in LOOPBACK mode. we test the uart port directly, So we can test one uart > port Rx and Tx functions at the same time . > here is the diff serialcheck with loopback patch > So I'd prefer use loopback mode test the uart in case. > $ diff serialcheck.c serialcheck-with-loopback.c Thanks for the hint, I had no idea that subset serial port hardware has a loopback test that could be enabled in modem control register which is meant for testing. I will have a closer look tomorrow. -- Cyril Hrubis chrubis@suse.cz