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Re: [Qemu-devel] Printing bogus values in ne2000_asic_ioport_read()/ ne2


From: Joseph Stewart
Subject: Re: [Qemu-devel] Printing bogus values in ne2000_asic_ioport_read()/ ne2000_receive()
Date: Wed, 1 Mar 2006 13:47:08 -0500

Change the function argument from signed to unsigned and see it printf handles prints the values correctly. I.E.

static void print_packet(unsigned char *s, int len) ...

-joe

On 2/25/06, Umamaheswararao Karyampudi <address@hidden> wrote:
Hi,
I am using QEMU in one of my research projects. I
landed in a problem where I see bogus numbers being
printed when I printed the packet/each word that is
received from ne2000.

In ne2000_receive(), I copied the packet received to a
static char [] and printed the packet using
static void print_packet(char *s, int len)
{
  int i,j;
  for (i=0;i<len;i++) {
      if (i%20 == 0)
          printf("\n");
      printf("%02x ", s[i]);
  }
          printf("\n");
}
And some bytes it prints as fffffffff<last byte>
instead of just the last byte.
For eg:
52 54 00 12 34 56 00 ffffffff 4f 0a 46 05 08 00 45 00
00 ffffff80 00 00
40 00 40 01 ffffffbc 2b ffffffc0 ffffffa8 fffffffe
fffffffe ffffffc0 ffffffa8 ff

Similarly in ne2000_asic_ioport_read(), I print each
word that is read from NetDriverState.s->mem using the
following -
printf("\n %02x %02x", (char)(ret &0xff), (char) (
(ret >> 8) && 0xff));
And occasionally I see the 4 bytes printed instead of
1 byte for each value.

Any reason why it happens? Also,
ne2000_asic_ioport_read(), reads 6 bytes before
reading actual packet? I can think of 4 bytes for CRC
but not for the remaining 2 bytes  - eg - If pak is -
52 54 00 12 34 56 00 ffffffff 4f 0a 46 05 08 00 45 00
00 ffffff80 00 00
40 00 40 01 ffffffbc 2b
In asic_ioport_read() -
rdw 01 59
rdw 92 00
rdw 52 54
rdw 52 54
rdw 00 12
rdw 34 56

Anyhelp is greatly appreciated.

Thanks
Uma


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