Help in setting up a RAM Disk

Chris Johns chrisj at
Wed Mar 9 06:07:38 UTC 2011

On 8/03/11 7:16 PM, Peter Dufault wrote:
> On Mar 7, 2011, at 11:38 , Chris Johns wrote:
>> Yes. One minor correction. From 4.10 you should be able to have 'main'
>> as an entry point.
> Yes, and this will be a great help for me to setup an environment for beginners.  In one of my libraries I put a default init.c that sets up an RTEMS shell with basic commands and installs a call to "main()" for the command "main".  Then one can use e.g. the basic Lua Makefile and genererate a "lua" one can download:
> [dufault at finny12 src]$ file /opt/rtems-4.11/powerpc-rtems4.11/phycore_mpc5554/bin/lua
> /opt/rtems-4.11/powerpc-rtems4.11/phycore_mpc5554/bin/lua: ELF 32-bit MSB executable, PowerPC or cisco 4500, version 1 (SYSV), statically linked, with unknown capability 0x41000000 = 0x13676e75, with unknown capability 0x10000 = 0xb0402, not stripped
> [dufault at finny12 src]$
> There are two problems -
> 1. The linker finds an init in one of the RTEMS libraries, so I use something like "-u force_load_my_main" in my Makefile and put:
> - extern int force_load_my_main;
> - int force_load_my_main;
> in my init.c to be sure I get the one I want;

I do not know what is happening here.

> 2. The main function is called with echo off and a record separator of newline, and no known way of entering a ^D/EOF to terminate the program.  Here's the results of entering 'print("where is my echo")<LF>' at the console to Lua, followed by ^D<LF>:
> SMC91111 : driver has been attached
> Device: /dev/pty0../dev/pty7 (8)pseudo-terminals registered.
> telnetd started with stacksize = 8192 and priority = 100
> RTEMS-RPCIOD $Release$, Till Straumann, Stanford/SLAC/SSRL 2002, See LICENSE file for licensing info.
> RTEMS-NFS $Release$, Till Straumann, Stanford/SLAC/SSRL 2002, See LICENSE file for licensing info.
> RTEMS SHELL (Ver.1.0-FRC):/dev/console. Mar  6 2011. 'help' to list commands.
> [/] # help main
> main         - Run the "main program".
> [/] # main
> Lua 5.1.4  Copyright (C) 1994-2008, PUC-Rio
>> where is my echo
>> stdin:1: unexpected symbol near 'char(4)'
> The same issue exists with telnet, though at least then you can shutdown the shell and Lua gets the EOF.

Why not capture the terminal settings and then restore them when you 
return ?

I am not sure what happens if we change the settings for commands. Some 
commands may access stdin and may be written for the current term settings.

> Shall I enter those items as a bug report to be examined and/or ignored as appropriate?

I am not sure. :)


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