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Re: questions about undi patch


From: Thomas Reifferscheid
Subject: Re: questions about undi patch
Date: Wed, 21 Jul 2004 15:59:28 +0200 (CEST)

As this message contains a CC: to Mr. Brown here
is again some short explanation:

http://lists.gnu.org/archive/html/bug-grub/2004-07/msg00063.html


Here is about the strange problem as I know of it:

int eb_pxenv_undi_isr ( void ) {
        grub_printf("%x => ",undi.pxs->undi_isr.FuncFlag);
        success = undi_call ( PXENV_UNDI_ISR );
        grub_printf("%x\n",undi.pxs->undi_isr.FuncFlag);
        return success;
}

get's called.

Let's have a look on undi.pxs->undi_isr.FuncFlag:
(from pxe.h)
#       define PXENV_UNDI_ISR_IN_START          1
#       define PXENV_UNDI_ISR_IN_PROCESS        2
#       define PXENV_UNDI_ISR_IN_GET_NEXT       3
#       define PXENV_UNDI_ISR_OUT_OURS          0
#       define PXENV_UNDI_ISR_OUT_NOT_OURS      1
#       define PXENV_UNDI_ISR_OUT_DONE          0
#       define PXENV_UNDI_ISR_OUT_TRANSMIT      2
#       define PXENV_UNDI_ISR_OUT_RECEIVE       3
#       define PXENV_UNDI_ISR_OUT_BUSY          4
 /* yes, strange. */
1 => 0
2 => 3
3 => 0
1 => 0
2 => 0
1 => 0
2 => 3
3 => 0
1 => 0
2 => 0
1 => 0
2 => 3
3 => 0
1 => 0
2 => 0
1 => 0
2 => 3
3 => 0
1 => 0
2 => 0
1 => 0
2 => 3
3 => 0
1 => 0
2 => 0
1 => 0
2 => 3
3 => 3
3 =>

/* poff, never returning */

Strange, isnt it?
If I manually set it back to 0, all seems to work fine
(although I did not yet compare a memory-dump with my
original files initrd.gz/tftpboot.img)

Let's see about some variables when this occurs:

nic->packet                             : 0x215a2
nic->packetlen                          : 0x5c6
undi.pxs->undi_isr.Frame.segment        : 0x8200
undi.pxs->undi_isr.Frame.offset         : 0x2ee4
undi.pxs->undi_isr.BufferLength         : 0x3c
undi.pxs->undi_isr.FuncFlag             : 0x3



How to interpret this?


Greetings,
Thomas





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