[ELDK] R: Resource temporarily unavailable

Luigi Rizzi rizzi at algorab.com
Thu Nov 11 18:23:52 CET 2010

Dear Wolfgang,

on the original STK board SSC2 is used for the communication with the
Ethernet Interface, so signals TXD2,RXD2,RTS2,CTS2,CS are connected to
On my carrier board I connected TXD2, RXD2 and RTSD2 to the RS485 driver,
and leave unconnected the others. 
Actually on the STK board I can connect or leave floating all these lines by
using some jumpers... and with every configuration things works always
Beside the signals mentioned above there are other lines that I should
check? Or a particular condition that can cause this problem?

The version I'm using is the one supplied by the module constructor (TQ) and
actually I don’t know how long it should take to jump at these new
versions... Could you give me your opinion also about that?

Best regards,

-----Messaggio originale-----
Da: Wolfgang Denk [mailto:wd at denx.de] 
Inviato: lunedì 8 novembre 2010 23.56
A: Luigi Rizzi
Cc: eldk at lists.denx.de
Oggetto: Re: [ELDK] Resource temporarily unavailable

Dear Luigi Rizzi,

In message <28EC12D487C391468508F50C4A67A23901B3F02184B7 at ermes.algorab.eu>
you wrote:
> The original kernel of my TQM885D module with U-boot 1.3.0-rc2 and Linux
> 4.25, has got the Ethernet support via MPC8xx Serial Communication
> er SCC2.
> Unfortunately I need to use SSC2 as UART in my system. So I recompiled the
> kernel setting:
> -Enable Ehternet Support Via serial communication controller on SCC1
> -Enable SCC for UART
> -Use SCC2 for UART
> On the original carrier board (from TQ) everything works fine! I can send,
> receive data and drive RTS line properly...
> But, when I mount the module on my own carrier board, using this uart I
> nd:
> "Resource temporarily unavailable"
> And this time also the RTS line is not driven?
> Any hint?

Sorry, but you don't even mention what the differences between your
custom carrier board and the STK8xx board might be.  How could we even
guess then what might be wrong in yoru configuration?

Please also note that you are running very old versions of the
software. Any reason why you don't use for example U-Boot v2010.09 and
Linux 2.6.36 ?

Best regards,

Wolfgang Denk

DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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