Re: [microblaze-uclinux] UDP packet reception triggers a hangup on the m

Hi,
We used to have the same problem, although we don't use xemac. Without going into possibly misleading details, we noticed a one-line difference between our entry.S and the one in the Petalogix tree. After making the change we've been able to run a simple script that continuously sends packets to the board for several days without crashing. Running the same script before the change, the system would freeze in seconds. I hope this helps, here's an attachment just in case.

Location - petalinux/software/linux-2.6.x-petalogix/arch/microblaze/kernel/entry.S

Hello All,



when I transmit a continously stream of UDP packets to the microblaze

a hangup is triggered,  I have the following configuration:



- petalinux-v0.30-rc1 software

- xemac linux driver in PIO mode

- xemac IP block which is connected via a PLB <-> OPB bridge to the

ublaze. (the xemac is configured with "No DMA" and IPIF

(recieve/transmit buffers) are set to 32768 bytes and FIFO depth of

16.)

- EDK 9.2.02. with the patch (AR30051) from Xilinx for the microblaze v7.00.b.

- 2 uarts, one for kernel console, other one for  shell access.

- ML506 Evalutation platform



I tried to capture the packets via AF_PACKET and AF_INET, both methods

gave the same result -> a kind of hangup of the microblaze:



symptoms:

1) no serial input is taken from both terminals

2) a ping to the microblaze doesn't send a reply packet back.



Has anybody seen this behavior before with the xemac connected via the

OPB (PLB<->OPB) to the PLB bus, or is this setup with a bridge in

between

asking for trouble and should I look for an alternative?





Best regards,

Bas



--- some additional info





Linux tmb 2.6.20-uc0 #1 Tue Nov 25 14:27:21 CET 2008 microblaze



CPU-Family:     MicroBlaze

FPGA-Arch:      virtex5

CPU-Ver:        Unknown

CPU-MHz:        125.00

BogoMips:       62.05

HW-Div:         yes

HW-Shift:       yes

Icache:        8kB

Dcache:        8kB

HW-Debug:       yes



  PID PORT STAT SIZE SHARED %CPU COMMAND

1      S    135K     0K  0.0 /bin/init

2      R      0K     0K  0.0 ksoftirqd/0

3      S      0K     0K  0.0 events/0

4      S      0K     0K  0.0 khelper

5      S      0K     0K  0.0 kthread

6      S      0K     0K  0.0 kblockd/0

7      S      0K     0K  0.0 pdflush

8      S      0K     0K  0.0 pdflush

9      S      0K     0K  0.0 kswapd0

10      S      0K     0K  0.0 aio/0

11      S      0K     0K  0.0 mtdblockd

24      S      0K     0K  0.0 jffs2_gcd_mtd4

40   S0 S    656K     0K  0.0 /bin/sh

41   S0 S    643K     0K  0.0 /bin/sh --

42      S     67K     0K  0.0 /bin/inetd

55   S0 R     68K     0K  0.0 ps



pseudo code:



ethernet mac is running at 100 BaseTX-FD



sender:  (host PC)

    sd_ = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

    sendto(sd_, buf, BUFLEN, 0, (struct sockaddr*)&sa_, (socklen_t)sizeof(sa_));



receiver (Microblaze)

 sd_ = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

 bind(sd_, (struct sockaddr*)&sa, sizeof(sa))

  if (!select(sd_+1, &rfds, 0, 0, &timeout)) { break; }

 size = recv(sd_, buf, BUFLEN, 0);

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Re: [microblaze-uclinux] UDP packet reception triggers a hangup on the microblaze