Re: no serial output when using cdk/ncurses with Fbsplash

[Thomas Dickey]

On Thu, Apr 02, 2015 at 07:57:59AM +0200, daggs wrote:
> 
> 
> > Sent: Thursday, April 02, 2015 at 4:02 AM
> > From: "Thomas Dickey" <address@hidden>
> > To: daggs <address@hidden>
> > Cc: address@hidden
> > Subject: Re: no serial output when using cdk/ncurses with Fbsplash
> >
> > On Wed, Apr 01, 2015 at 12:32:07PM +0200, daggs wrote:
> > > Greetings,
> > > 
> > > I have a usb image that boots something called Fbsplash (see: 
> > > https://wiki.gentoo.org/wiki/Fbsplash).
> > > this requires booting the system with uvesa enabled.
> > > part of our gui I cdk based and the usb prints the output to both the 
> > > screen and serial port for saving.
> > > 
> > > if I disable uvesa, I see all the outputs on both the screen and the 
> > > serial port but if I enable it, I'm missing outputs on serial when we use 
> > > cdk.
> > > I've looked into the code of cdk and saw it is done in ncurses, looking 
> > > at ncurses's code didn't labeled out anything special.
> > > 
> > > my only hunch is that ncurses writes directly into the vga buffer when 
> > > not using uvesa. is that correct?
> > > when using uvesa, where does ncurses writes to?
> > 
> > no - ncurses only knows how to write escape sequences to the terminal...
> > 
> > (MinGW port is a different case, but we've not mentioned that so far)
> > 
> 
> so the issue is that in terminal mode stdout is somehow connected into serial 
> when using ncurses while in uvesa mode it doesn't?

I suppose so - in any case, ncurses does not know anything about that :-)

-- 
Thomas E. Dickey <address@hidden>
http://invisible-island.net
ftp://invisible-island.net

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