From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marek Vasut Date: Thu, 25 Oct 2012 21:03:47 +0200 Subject: [U-Boot] [PATCH 3/6] serial: Reorder serial_assign() In-Reply-To: References: <1349568426-27219-1-git-send-email-marex@denx.de> <20121022172326.GA13201@badger> Message-ID: <201210252103.47233.marex@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Dear Simon Glass, > Hi, > > On Mon, Oct 22, 2012 at 10:23 AM, Allen Martin wrote: > > On Sat, Oct 20, 2012 at 01:19:00AM -0700, Marek Vasut wrote: > >> Dear Allen Martin, > >> > >> [...] > >> > >> > Hi Marek, the change to return value here broke serial output on > >> > tegra. What I see is that the serial device name (s->name) is > >> > "eserial0" as set by serial_ns16550.c, and the name passed in from the > >> > stdout environment is "serial" so they don't match and it fails. This > >> > always used to be ok because the return code didn't indicate failure > >> > and iomux_doenv() would continue on happily, but now it causes > >> > iomux_doenv() to fail and no printfs() work after that. > >> > > >> > Not sure what the right fix is, should stdout really be set to > >> > "eserial0"? It seems "serial" should mean "the default serial device" > >> > which for the normal case is the one and only device. > >> > >> Looking at the source, the obvious course of action is to fix iomux.c . > > > > I've been looking at this call to serial_assign() from iomux.c and I'm > > not convinced this code does anything meaningful at all. It passes > > the name of a struct stdio_dev device which serial_assign() then tries > > to match against the registered struct serial_devices, which will > > never match. > > > > What I don't understand is the case where you have a board that > > actually has more than one physical serial port and how the mapping > > from stdio_dev to serial_device happens. > > > > Also, looking at the code to cmd_nvedit, I think your change also broke > > "setenv stdout" for boards that don't define CONFIG_CONSOLE_MUX. We > > always have this on for tegra, so we don't go down this code path, but > > it looks identical to the code in iomux.c > > Sorry if I missed it - what was the resolution here? Should we revert > that change? Definitelly not. We should fix the iomux.c , possibly by flipping the inequation mark as a short term solution. Best regards, Marek Vasut