I compiled Bochs on Linux and installed a linux
in it, but when I ping a machine on my LAN, I get
packet loss. Sometimes as much as 70% is lost.
So I read ne2k.cc, Linux 8390 driver and 8390 chip
specification. I find that 8390 command register START
bit is misused in ne2k.cc. According to the chip
specification, even if START=0, the chip does not stop
working.
appeared in the guest OS. Full description:
> After much grovelling through the 8390 docs, I think this is the
> correct answer to the odd-length packet problem I was having with
> the ne2k driver under Linux.
>
> According to the datasheet, the 8390 always accesses its buffer
> memory in word-size chunks if the WTS bit of the DCR is set. So
> it will always send a word to the host bus interface if WTS==1.
> It's up to the host bus interface to deliver the the number of
> requested bytes to the host. So disallowing a byte read when the
> WTS bit is set is wrong (IMO) as the bus interface may allow it,
> as the NE2000 appears to.
>
> The patch to ne2k.h bumps the receive buffer memory size to 32K.
> This fixes the "out-of-bounds chipmem read" errors I was getting.
>
> Can someone with an NE2K datasheet verify these changes? They
> jibe with the Linux ne.c driver, anyway.
To see the commit logs for this use either cvsweb or
cvs update -r BRANCH-io-cleanup and then 'cvs log' the various files.
In general this provides a generic interface for logging.
logfunctions:: is a class that is inherited by some classes, and also
. allocated as a standalone global called 'genlog'. All logging uses
. one of the ::info(), ::error(), ::ldebug(), ::panic() methods of this
. class through 'BX_INFO(), BX_ERROR(), BX_DEBUG(), BX_PANIC()' macros
. respectively.
.
. An example usage:
. BX_INFO(("Hello, World!\n"));
iofunctions:: is a class that is allocated once by default, and assigned
as the iofunction of each logfunctions instance. It is this class that
maintains the file descriptor and other output related code, at this
point using vfprintf(). At some future point, someone may choose to
write a gui 'console' for bochs to which messages would be redirected
simply by assigning a different iofunction class to the various logfunctions
objects.
More cleanup is coming, but this works for now. If you want to see alot
of debugging output, in main.cc, change onoff[LOGLEV_DEBUG]=0 to =1.
Comments, bugs, flames, to me: todd@fries.net
