Re: [ECOS] Application loading from hyper terminal

Re: [ECOS] Application loading from hyper terminal

[Gary Thomas]

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Please copy all email to the eCos discussion list ecos-discuss.

On 27-Jul-2001 Ashutosh Sharma wrote:
> Following is the result from version command:
> 
> RedBoot(tm) bootstrap and debug environment - built
> 05:37:52, Jun  8 2001
> 
> Platform: PC (I386)
> Copyright (C) 2000, 2001, Red Hat, Inc.
> 
> RAM: 0x00000000-0x000a0000, 0x0007c080-0x000a0000
> available
> RedBoot>
> 
> This is the small part of the objdump of the file
> 
> twothreads.exe:     file format elf32-i386
> 
> Disassembly of section .text:
> 
> 00108000 <_start>:
>   108000: e4 64       in     $0x64,%al
>   108002: a8 02        test   $0x2,%al
>   108004: 75 fa        jne    108000 <_start>
>   108006: e4 64       in     $0x64,%al
>   108008: a8 01       test   $0x1,%al
>   10800a: 74 04       je     108010 <_start+0x10>
>   10800c: e4 60       in     $0x60,%al
> 
> 
> These results are form the default configuration of
> the eCos build. Should I change the memory location in
> the RAM build of my application.

You're problem is an artifact of the PC system which we don't have a
perfect solution for (at the moment).  RedBoot will currently insist on
verifying that the memory you are trying to load into is "available".  On
this platform, RedBoot only knows about RAM up to 0xa0000 (see above).

If you want to rebuild RedBoot, you can apply this patch and disable the
CYGSEM_REDBOOT_VALIDATE_USER_RAM_LOADS option which should fix the problem 
you're seeing.

Don't forget, next time, copy to the list.

================ <cut-here>  =============================================

Index: redboot/current/src/load.c
===================================================================
RCS file: /home/cvs/ecc/ecc/redboot/current/src/load.c,v
retrieving revision 1.32
diff -u -5 -p -r1.32 load.c
--- redboot/current/src/load.c  2001/07/25 18:27:49     1.32
+++ redboot/current/src/load.c  2001/07/27 17:12:05
@@ -160,15 +160,17 @@ load_srec_image(int (*getc)(void), unsig
             }
             addr += addr_offset;
             if ((unsigned long)(addr-addr_offset) < lowest_address) {
                 lowest_address = (unsigned long)(addr - addr_offset);
             }
+#ifdef CYGSEM_REDBOOT_VALIDATE_USER_RAM_LOADS
             if ((addr < user_ram_start) || (addr > user_ram_end)) {
                 if (!verify_action("Attempt to load S-record data to address: %p\n"
                                    "RedBoot does not believe this is in RAM", (void*)addr))
                     return 0;
             }
+#endif
             count -= ((type-'1'+2)+1);
             offset += count;
             while (count-- > 0) {
                 val = _hex2(getc, 1, &sum);
                 *addr++ = val;
@@ -368,16 +370,18 @@ do_load(int argc, char *argv[])
         printf("File name missing\n");
         printf("usage: load %s\n", usage);
         return;
     }
 #endif
+#ifdef CYGSEM_REDBOOT_VALIDATE_USER_RAM_LOADS
     if (base_addr_set &&
         ((base < (unsigned long)user_ram_start) ||
          (base > (unsigned long)user_ram_end))) {
         if (!verify_action("Specified address (%p) is not believed to be in RAM", (void*)base))
             return;
     }
+#endif
     if (raw && !base_addr_set) {
         printf("Raw load requires a memory address\n");
         return;
     }
 #ifdef CYGPKG_REDBOOT_NETWORKING
Index: redboot/current/cdl/redboot.cdl
===================================================================
RCS file: /home/cvs/ecc/ecc/redboot/current/cdl/redboot.cdl,v
retrieving revision 1.55
diff -u -5 -p -r1.55 redboot.cdl
--- redboot/current/cdl/redboot.cdl     2001/07/27 15:13:45     1.55
+++ redboot/current/cdl/redboot.cdl     2001/07/27 17:12:03
@@ -217,10 +217,22 @@ cdl_package CYGPKG_REDBOOT {
             processors it may be necessary to reduce the size to
             avoid serial overruns. zlib appears to bail out if less than
             five bytes are available initially so this is the minimum."
     }
 
+    cdl_option CYGSEM_REDBOOT_VALIDATE_USER_RAM_LOADS {
+        display       "Validate RAM addresses during load"
+        flavor        bool
+        default_value 1
+        description   "
+          This option controls whether or not RedBoot will make sure that
+          memory being used by the \"load\" command is in fact in user RAM.
+          Leaving the option enabled makes for a safer environment, but this
+          check may not be valid on all platforms, thus the ability to
+          disable it.  ** Disable this only with great care **"
+    }
+
     cdl_component CYGPKG_REDBOOT_FLASH {
         display       "Allow RedBoot to support FLASH programming"
         flavor        bool
         default_value 1
         active_if     CYGPKG_IO_FLASH

Re: [ECOS] Application loading from hyper terminal

[Ashutosh Sharma]

Thanks for the patch. I have also disabled the option
for RAM validation. Now I am able to execute my
application using redboot.

Many Many ....... thanks

Ashutosh

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Re: [ECOS] Application loading from hyper terminal

[Jonathan Larmour]

Gary Thomas wrote:
> 
> You're problem is an artifact of the PC system which we don't have a
> perfect solution for (at the moment).  RedBoot will currently insist on
> verifying that the memory you are trying to load into is "available".  On
> this platform, RedBoot only knows about RAM up to 0xa0000 (see above).

Well, that's sort of what the verify action is for, but that doesn't make
sense for X/Y modem uploads I suppose. I don't have a spec for the X/Y
modem protocol, but presumably there is a way to tell the other end to
abort the upload? Then we could display the message and require a "-f" for
"force" argument? This would also make sense for the other points in the
function where we abort it with an error message. Otherwise there is no way
to ever see any problems until you cancel the upload on the host.

Jifl
-- 
Red Hat, Rustat House, Clifton Road, Cambridge, UK. Tel: +44 (1223) 271062
Maybe this world is another planet's Hell -Aldous Huxley || Opinions==mine

[ECOS] Application loading from hyper terminal

[Ashutosh Sharma]

Hi All
	I am working with the PC target. I have built RedBoot
for the same. I am trying to download my RAM build
application through Hyper Terminal, but not able to do
so. In the Hyper Terminal I am getting RedBoot prompt.
At the prompt, I am giving following commands:

RedBoot> load -m xmodem

After that lot of C's are coming up in the hyper
terminal window. Before receiving the time out
message, I am also sending the application file, using
the Send File Option. After sending  3 packets hyper
terminal stops sending data.

With the same RedBoot build, I am able to load and run
the same application to the target hardware using
debugger (i386-elf-gdb).

I have also read lot of mails, related to such
problem. But I don't find any solution for mine one. I
am also not able to execute commands like "fconf -1"
at redboot prompt. May be configuration problem. Is it
possible to set these at the build time? 

	I am using latest CVS repository of the eCos. I have
downloaded this last day i.e. 25th July 2001. What
should I do to solve these problem?


Thanks in advance.

Ashutosh


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Re: [ECOS] Application loading from hyper terminal

[Jesper Skov]

>>>>> "Ashutosh" == Ashutosh Sharma <ashutosh_hpm@yahoo.com> writes:

Ashutosh> Hi All I am working with the PC target. I have built RedBoot
Ashutosh> for the same. I am trying to download my RAM build
Ashutosh> application through Hyper Terminal, but not able to do
Ashutosh> so. In the Hyper Terminal I am getting RedBoot prompt.  At
Ashutosh> the prompt, I am giving following commands:

RedBoot> load -m xmodem

Please try Y-modem instead.

Jesper

Re: [ECOS] Application loading from hyper terminal

[Ashutosh Sharma]

I have tried with all, X Y Z modems but I am not able
to upload the file to the target hardware. :-( I have
also downloaded the pre built software but same
problem is there. I am using the default
configuration. What should I do now.

Ashutosh

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Re: [ECOS] Application loading from hyper terminal

[Gary Thomas]

On 27-Jul-2001 Ashutosh Sharma wrote:
> I have tried with all, X Y Z modems but I am not able
> to upload the file to the target hardware. :-( I have
> also downloaded the pre built software but same
> problem is there. I am using the default
> configuration. What should I do now.

What format is the data file in?  Remember that RedBoot's "load"
command only handles S-record files unless the '-r' flag is used.

If you try sending some other sort of file, e.g. an ELF binary,
to the "load" command, it will fail, but the error message most
likely will be lost (consumed) by the communications program (HyperTerm).
Bottom line - all you'll see is that it failed, without any real
indication of why.

Re: [ECOS] Application loading from hyper terminal

[Ashutosh Sharma]

I am using SREC format. Using following command, I am
converting the file

i386-elf-objcopy --target=srec source.exe target.hex
or
i386-elf-objcopy -O source.exe target.hex

on cygwin source file is source.exe and on linux
source only

Ashutosh

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Re: [ECOS] Application loading from hyper terminal

[Gary Thomas]

On 27-Jul-2001 Ashutosh Sharma wrote:
> I am using SREC format. Using following command, I am
> converting the file
> 
> i386-elf-objcopy --target=srec source.exe target.hex
> or
> i386-elf-objcopy -O source.exe target.hex
> 
> on cygwin source file is source.exe and on linux
> source only

Fair enough.  You're sure that the locations being used by the file
are writable by RedBoot?  It's quite careful, only allowing you to
load into "safe" memory locations.  Use the 'version' command to
show which memory locations will be allowed.