[U-Boot-Users] Problem about "printf"!

21 Jul 2005


      I have tried it! But all the commands can't work.
From the code,information printed in the serial
interface should be as below:
 "......
 DRAM: 16 MB 
 FLASH: 16 MB
 *** Warning - bad CRC, using default environment
In:  serial
 Out: serial
 Err: serial
=>
"
But it displays only as below:
 "......
 DRAM: 16 MB 
 FLASH: 16 MB
 *** Warning - bad CRC, using default environment
=>
"
The information"In:  serial Out: serial Err: serial"
can't be printed.
Why?
...
In message
20050720143726.9858.qmail@web15704.mail.cnb.yahoo.com
...
you wrote:
...
My uboot can run now! Through serial,prompt"=>"can
be
...
printed,but after input"help",it don't display
commands of uboot.
Does it work ith any command at all?  For  example, 
does  the  board
reset when you ype "reset" ?
...
It seems as if uboot can't find the standard input
and
...
output devices.
What makes you think so?
...
It display below:
......
DRAM: 16 MB 
FLASH: 16 MB
*** Warning - bad CRC, using default environment
=>
I find that function "printf" (in the
/common/console.c) can't execute. WHY? Please
give me
What makes you think so?
...
As below:
#ifndef CFG_CONSOLE_INFO_QUIET
  /* Print informations */
printf ("In:    ");
if (stdio_devices[stdin] == NULL) {
printf ("No input devices available!\n");
} else {
printf ("%s\n", stdio_devices[stdin]->name);
}
printf ("Out:   ");
if (stdio_devices[stdout] == NULL) {
printf ("No output devices available!\n");
} else {
printf ("%s\n", stdio_devices[stdout]->name);
}
printf ("Err:   ");
if (stdio_devices[stderr] == NULL) {
printf ("No error devices available!\n");
} else {
printf ("%s\n", stdio_devices[stderr]->name);
}
#endif /* CFG_CONSOLE_INFO_QUIET */
I don't see any of the "No ??? devices available!"
error messages  in
your  display,  so  I don't understand why you think
this should be a
problem?
Which board is this on? And which version of U-Boot?
Best regards,
Wolfgang Denk
-- 
Software Engineering:  Embedded and Realtime
Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80
Email: wd@denx.de
Madness has no purpose.  Or reason.  But it may have
a goal.
   -- Spock, "The Alternative Factor", stardate 3088.7
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junping feng

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