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Re: [lwip-users] send/receive issue with lwip - FBE - fatal bus error DM

From: Dave Nadler
Subject: Re: [lwip-users] send/receive issue with lwip - FBE - fatal bus error DMACSR 12 th bit
Date: Thu, 6 Feb 2020 06:46:15 -0800
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

Are you aware of (and you have fixed) all H7 driver bugs listed here?
Are you using LwIP 2.0.0 as distributed by ST, or the latest 2.1.2?

On 2/6/2020 5:43 AM, anandhram via lwip-users wrote:
confirm 510917de6b2772da55f5f72e5353185919cedca0

STM32 lwip stack issue - frames/not received/processed - FBE error
FBE bit 12 -Fatal bus error.
STM board used : STMh743
is there any timing problem or a configuration problem with the clock, bus
speed or DMA?
Environment : 100Mbit/s full duplex ethernet used. 

below are the additional information based on the new tests.
from the ethernet analyzer , its been found the error occurs at the below
    1. time interval <40us ,dataframes sent out and received by STM32h7
        DMACSR FBE error is set.same issue is reported by switch also as
error frames.
        note: the same issue is observed with evaluation board also.
    2. if time interval >40us to miliseconds ,dataframes sent out and
received by STM32h7 board
       is received and sent correctly without any errors.

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Dave Nadler, USA East Coast voice (978) 263-0097, address@hidden, Skype 

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