bge(4) on BCM 5752 A02 panic due to media autoselect

Ganbold ganbold at micom.mng.net
Thu Aug 31 00:46:15 UTC 2006


David Christensen wrote:
>> Recently one of my colleagues found that BCM 5752 A02 on Dell Latitude
>> D820 would get "panic: invalid ife->ifm_data (0xa) in 
>> mii_phy_setmedia".
>>  After some investigation I have found that removing BCMR_ANEG from
>> mii_capabilities in ukphy.c would work around the problem, 
>> and it turns
>> out that without explicitly specifying media type, the code 
>> will finally
>> get to pass the "intentionally invalid index" to mii_phy_setmedia and
>> trigger an assertion fail.
>>
>> I have not tested the situation in -STABLE yet, but it was 
>> said to work
>> there, though.  Is there anyone can shed some light to me about how to
>> debug the issue?  Thanks in advance!
>>
>> PS. During the debugging I have found that the attached patch can make
>> "bge0: firmware handshake timeout" issue disappear from the said chip.
>> Because I do not have Broadcom specification at hand I would 
>> like to see
>> if there is someone to give appropriate review for it.
>>     
>
> Try the attached patch instead and let me know if it works.  When
> FastBoot
> is enabled on supported Broadcom controllers it allows the controller to
> skip rereading firmware after a reset, allowing the driver to complete 
> its initialization more quickly.  The Linux driver specifically disables
> FastBoot because it performs some read/write tests to controller memory,
> potentially corrupting the firmware, so FastBoot is disabled to insure
> an
> error free firmware reload.  We don't do the same test so the same
> change
> isn't necessary.  The patch happens to work because the bge driver
> doesn't
> perform firmware synchronization correctly, and the firmware initializes
> too fast for the driver.
>
> Dave
>   
>   
I'm using RELENG_6 and delphij@'s patch works.
I will back out delphij@'s patch and try your patch and let you know the 
result.

Ganbold

> ------------------------------------------------------------------------
>
> Index: if_bge.c
> ===================================================================
> RCS file: /home/ncvs/src/sys/dev/bge/if_bge.c,v
> retrieving revision 1.140
> diff -p -u -r1.140 if_bge.c
> --- if_bge.c	24 Aug 2006 14:41:16 -0000	1.140
> +++ if_bge.c	30 Aug 2006 18:50:19 -0000
> @@ -2326,6 +2326,12 @@ bge_reset(struct bge_softc *sc)
>  		}
>  	}
>  
> +	/*
> +	 * Write the magic number to the firmware mailbox at 0xb50
> +         * so that the driver can synchronize with the firmware.
> +	 */
> +	bge_writemem_ind(sc, BGE_SOFTWARE_GENCOMM, BGE_MAGIC_NUMBER);
> +
>  	/* Issue global reset */
>  	bge_writereg_ind(sc, BGE_MISC_CFG, reset);
>  
> @@ -2362,11 +2368,6 @@ bge_reset(struct bge_softc *sc)
>  		CSR_WRITE_4(sc, BGE_MARB_MODE, BGE_MARBMODE_ENABLE);
>  
>  	/*
> -	 * Prevent PXE restart: write a magic number to the
> -	 * general communications memory at 0xB50.
> -	 */
> -	bge_writemem_ind(sc, BGE_SOFTWARE_GENCOMM, BGE_MAGIC_NUMBER);
> -	/*
>  	 * Poll the value location we just wrote until
>  	 * we see the 1's complement of the magic number.
>  	 * This indicates that the firmware initialization
> Index: if_bgereg.h
> ===================================================================
> RCS file: /home/ncvs/src/sys/dev/bge/if_bgereg.h,v
> retrieving revision 1.52
> diff -p -u -r1.52 if_bgereg.h
> --- if_bgereg.h	23 Aug 2006 11:32:54 -0000	1.52
> +++ if_bgereg.h	30 Aug 2006 18:50:20 -0000
> @@ -1768,10 +1768,11 @@
>  	} while(0)
>  
>  /*
> - * This magic number is used to prevent PXE restart when we
> - * issue a software reset. We write this magic number to the
> - * firmware mailbox at 0xB50 in order to prevent the PXE boot
> - * code from running.
> + * This magic number is written to the firmware mailbox at 0xb50
> + * before a software reset is issued.  After the internal firmware
> + * has completed its initialization it will write the opposite of 
> + * this value, ~BGE_MAGIC_NUMBER, to the same location, allowing the
> + * driver to synchronize with the firmware.
>   */
>  #define BGE_MAGIC_NUMBER                0x4B657654
>  
>   
> ------------------------------------------------------------------------
>
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