From mboxrd@z Thu Jan 1 00:00:00 1970 From: Cristiano Ligieri Pereira To: ecos-discuss@sourceware.cygnus.com Subject: Re: [ECOS] Port problem Date: Thu, 16 Aug 2001 22:47:00 -0000 Message-id: References: X-SW-Source: 2001-08/msg00582.html Hi again! I don't know whether my previous question made no sense or if it was too simple... since I've got no answer. :-| I'm working on the port of an XScale based platform. So far I have done a reasonable progress (in my opinion...) but now I'm kind of stuck. :( I started the port copying the IQ80310 and modifying it's files since both platforms are quite different (except the processor, obviously). Then the next thing I did was to clean up the macro PLATFORM_SETUP1 so that the specific IQ80310 initializations were removed and the specific initializations of my platform were inserted (those I got from CygMon source code). After this I've changed the memory map (that I actually sent to this list yesterday) so that I have RAM at 0x0. After this I've been trying two things: load a Hello World eCos application configured to execute on RAM (by means of GDB/Cygmon) and load RedBoot configured to execute at RAM as well. For both I load the application at the original RAM address (since for cygmon this is still the RAM memory address) and for both I'm executing the code in PLATFORM_SETUP1, which remaps the memory. When I try to execute the Hello World application the code crashes when calling diag_printf function in the main body. For the RAM/RedBoot code it is crashing when cleaning the BSS (I've checked the addresses I'm hitting and they fall within the original memory addresses 0xC0000000). how should I do about the serial communication with the host? Can I reuse the communication already established with CygMon? Do I need to break it and restart a new connection? Am I on the right track? I was feeling good about it till two days ago. But now that I'm stuck I getting frustrated instead. :-| Thanks again, Cristiano. > Hi all, > > I'm porting eCos to a XScale based platform. The board have Cygmon in its > Flash memory, which is invoked at reset time. I can load an eCos > application in it (I'm modifying the port to IQ80310). So far I have > modified the file PLATFORM_SETUP1, in which I change the memory map and > initialize (or re-initialize since cygmon initialize them already) all the > necessary components (caches, BTB, MMU, etc...). All this seems to work > fine. The memory mapping is changed so that I have SDRAM at address 0x0. > > Now I'm a little confused on how to make the serial communication work. I > can download an application using GDB. So obviously there is a connection > between the target and the GDB in the host. What should I do to keep using > this connection to send debugging messages to the host? Or should I break > this connection and restart it somehow? > > Thanks in advance, > Cristiano. > > ------------------------------------------------------------ > Cristiano Ligieri Pereira - http://www.ics.uci.edu/~cpereira