[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Help in setting up a RAM Disk
- Date: Tue, 8 Mar 2011 03:16:58 -0500
- From: dufault at hda.com (Peter Dufault)
- Subject: Help in setting up a RAM Disk
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;
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 Lua.org, 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.
Shall I enter those items as a bug report to be examined and/or ignored as appropriate?
HD Associates, Inc. Software and System Engineering