[#4836] kgdb on bf527-ezkit would have Ignoring packet error

Submitted By: Mingquan Pan

Open Date

2009-01-22 04:17:01 Close Date

2009-02-09 04:04:08

Priority:

Medium Assignee:

Sonic Zhang

Status:

Closed Fixed In Release:

N/A

Found In Release:

N/A Release:

Category:

N/A Board:

N/A

Processor:

BF527 Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Fixed

Uboot version or rev.:

Toolchain version or rev.:

Jan 17,2009

App binary format:

N/A

Summary: kgdb on bf527-ezkit would have Ignoring packet error

Details:

kgdb on bf527-ezkit would have Ignoring packet error now.

## Booting image at 02000000 ...

Image Name: Linux-2.6.28-ADI-2009R1-pre-svn6

Created: 2009-01-21 5:20:52 UTC

Image Type: Blackfin Linux Kernel Image (gzip compressed)

Data Size: 3853381 Bytes = 3.7 MB

Load Address: 00001000

Entry Point: 001b7524

Verifying Checksum ... OK

Uncompressing Kernel Image ... OK

Starting Kernel at = 1b7524

Linux version 2.6.28-ADI-2009R1-pre-svn6027 (test@uclinux60-bf527-std) (gcc version 4.1.2 (ADI svn)) #30 Wed Jan 21 13:20:33 CST 2009

Board Memory: 64MB

Kernel Managed Memory: 64MB

Memory map:

fixedcode = 0x00000400-0x00000490

text = 0x00001000-0x00126100

rodata = 0x00126100-0x001822e8

bss = 0x001822f0-0x00196f50

data = 0x00196f50-0x001aa000

stack = 0x001a8000-0x001aa000

init = 0x001aa000-0x0073c000

available = 0x0073c000-0x03eff000

DMA Zone = 0x03f00000-0x04000000

Hardware Trace Active and Enabled

Boot Mode: 1

Compiled for ADSP-BF527 Rev 0.0

Blackfin Linux support by blackfin.uclinux.org/

Processor Speed: 525 MHz core clock and 131 MHz System Clock

NOMPU: setting up cplb tables

Instruction Cache Enabled for CPU0

Data Cache Enabled for CPU0 (write-through)

Built 1 zonelists in Zone order, mobility grouping off. Total pages: 16001

Kernel command line: console=ttyBF0,57600 kgdboe=@10.100.4.50/,@10.100.4.174/

kgdboe: local port 6443

kgdboe: local IP 10.100.4.50

kgdboe: interface eth0

kgdboe: remote port 6442

kgdboe: remote IP 10.100.4.174

kgdboe: remote ethernet address ff:ff:ff:ff:ff:ff

Configuring Blackfin Priority Driven Interrupts

PID hash table entries: 256 (order: 8, 1024 bytes)

console [ttyBF0] enabled

Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)

Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)

Memory available: 56520k/65536k RAM, (5704k init code, 1172k kernel code, 528k data, 1024k dma, 584k reserved)

Calibrating delay loop... 1044.48 BogoMIPS (lpj=2088960)

Security Framework initialized

Mount-cache hash table entries: 512

Blackfin Scratchpad data SRAM: 4 KB

Blackfin L1 Data A SRAM: 16 KB (15 KB free)

Blackfin L1 Data B SRAM: 16 KB (16 KB free)

Blackfin L1 Instruction SRAM: 48 KB (42 KB free)

PDA for CPU0 reserved at 00183368

net_namespace: 288 bytes

NET: Registered protocol family 16

Blackfin GPIO Controller

Blackfin DMA Controller

ezkit_init(): registering device resources

usbcore: registered new interface driver usbfs

usbcore: registered new interface driver hub

usbcore: registered new device driver usb

musb_hdrc: version 6.0, pio, host, debug=0

musb_hdrc: USB Host mode controller at ffc03800 using PIO, IRQ 59

musb_hdrc musb_hdrc.0: MUSB HDRC host driver

musb_hdrc musb_hdrc.0: new USB bus registered, assigned bus number 1

usb usb1: configuration #1 chosen from 1 choice

hub 1-0:1.0: USB hub found

hub 1-0:1.0: 1 port detected

NET: Registered protocol family 2

IP route cache hash table entries: 1024 (order: 0, 4096 bytes)

TCP established hash table entries: 2048 (order: 2, 16384 bytes)

TCP bind hash table entries: 2048 (order: 1, 8192 bytes)

TCP: Hash tables configured (established 2048 bind 2048)

TCP reno registered

NET: Registered protocol family 1

msgmni has been set to 110

io scheduler noop registered

io scheduler anticipatory registered (default)

io scheduler cfq registered

bfin-t350mcqb: 320x240 24-bit RGB FrameBuffer initializing...

dma_alloc_init: dma_page @ 0x0302f000 - 256 pages at 0x03f00000

bfin-otp: initialized

Serial: Blackfin serial driver

bfin-uart.1: ttyBF0 at MMIO 0xffc02000 (irq = 31) is a BFIN-UART

brd: module loaded

bfin_mac_mdio: probed

bfin_mac: attached PHY driver [Generic PHY] (mii_bus:phy_addr=0:01, irq=-1, mdc_clk=2500000Hz(mdc_div=25)@sclk=131MHz)

bfin_mac bfin_mac.0: Blackfin on-chip Ethernet MAC driver, Version 1.1

kgdboe: local port 6443

kgdboe: local IP 10.100.4.50

kgdboe: interface eth0

kgdboe: remote port 6442

kgdboe: remote IP 10.100.4.174

kgdboe: remote ethernet address ff:ff:ff:ff:ff:ff

kgdboe: device eth0 not up yet, forcing it

kgdboe: carrier detect appears untrustworthy, waiting 4 seconds

PHY: 0:01 - Link is Up - 100/Full

kgdb: Registered I/O driver kgdboe.

kgdboe: debugging over ethernet enabled

m25p80 spi0.1: m25p16 (2048 Kbytes)

Creating 2 MTD partitions on "m25p80":

0x00000000-0x00040000 : "bootloader(spi)"

0x00040000-0x00200000 : "linux kernel(spi)"

bfin-spi bfin-spi.0: Blackfin on-chip SPI Controller Driver, Version 1.0, regs_base@ffc00500, dma channel@7

rtc-bfin rtc-bfin: rtc core: registered rtc-bfin as rtc0

hid_tmff: Unknown symbol _input_ff_create_memless

usbcore: registered new interface driver usbhid

usbhid: v2.6:USB HID core driver

TCP cubic registered

NET: Registered protocol family 17

rtc-bfin rtc-bfin: setting system clock to 2004-06-01 10:58:11 UTC (1086087491)

Freeing unused kernel memory: 5704k freed

usb 1-1: new high speed USB device using musb_hdrc and address 2

usb 1-1: configuration #1 chosen from 1 choice

_____________________________________

a8888b. / Welcome to the uClinux distribution \

d888888b. / _ _ \

8P"YP"Y88 / | | |_| __ __ (TM) |

8|o||o|88 _____/ | | _ ____ _ _ \ \/ / |

8' .88 \ | | | | _ \| | | | \ / |

8`._.' Y8. \ | |__ | | | | | |_| | / \ |

d/ `8b. \ \____||_|_| |_|\____|/_/\_\ |

dP . Y8b. \ For embedded processors including |

d8:' " `::88b \ the Analog Devices Blackfin /

d8" 'Y88b \___________________________________/

:8P ' :888

8a. : _a88P For further information, check out:

._/"Yaa_: .| 88P| - blackfin.uclinux.org/

\ YP" `| 8P `. - docs.blackfin.uclinux.org/

/ \.___.d| .' - www.uclinux.org/

`--..__)8888P`._.' jgs/a:f - www.analog.com/blackfin

Have a lot of fun...

BusyBox v1.13.2 (2009-01-21 08:21:29 CST) built-in shell (msh)

Enter 'help' for a list of built-in commands.

root:/>

#### Debugging is through ethernet port.

************** STEP 3: Start KGDB TEST

ifconfig eth0 10.100.4.50

root:/> GNU gdb 6.6

GDB is free software, covered by the GNU General Public License, and you are

welcome to change it and/or distribute copies of it under certain conditions.

Type "show copying" to see the conditions.

There is absolutely no warranty for GDB. Type "show warranty" for details.

This GDB was configured as "--host=i686-pc-linux-gnu --target=bfin-uclinux"...

(gdb)

Case 1 ...PASS

target remote udp:10.100.4.50:6443

warning: The remote protocol may be unreliable over UDP.

Some events may be lost, rendering further debugging impossible.

Remote debugging using udp:10.100.4.50:6443

kgdb_breakpoint () at kernel/kgdb.c:1722

Case 2 ...PASS

1722 atomic_set(&kgdb_setting_breakpoint, 0);

(gdb) break kgdb_test

Breakpoint 1 at 0x87c2: file arch/blackfin/kernel/kgdb_test.c, line 54.

Case 3 ...PASS

(gdb) c

Continuing.

Case 4 ...PASS

root:/> [New Thread 215]

Ignoring packet error, continuing...

Program received signal SIGTRAP, Trace/breakpoint trap.

[Switching to Thread 215]

0x00000000 in ?? ()

(gdb) test@uclinux60-bf527-std:~/work/cruise/checkouts/uclinux-dist/testsuites/kgdb> ps aux | grep bfin-uclinux-gdb

test 28411 1.6 2.7 33412 28656 pts/4 Ss+ 13:21 0:00 bfin-uclinux-gdb /home/test/work/cruise/checkouts/uclinux-dist/linux-2.6.x/vmlinux

test 28422 0.0 0.0 2852 724 pts/6 S+ 13:22 0:00 grep bfin-uclinux-gdb

test@uclinux60-bf527-std:~/work/cruise/checkouts/uclinux-dist/testsuites/kgdb> kill -9 `pidof bfin-uclinux-gdb`

test@uclinux60-bf527-std:~/work/cruise/checkouts/uclinux-dist/testsuites/kgdb>

Case 5 ...FAIL

Follow-ups

--- Sonic Zhang 2009-02-04 02:50:08

One of the UDP packets sent out with POLL mode in kgdb kernel is malformed. It

seems a bug in the kernel UDP stack.

0000 00 1d 0f 0b 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........

0010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........

0020 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ........ ........

0030 00 00 00 00 00 00 00 00 00 00 00 00 ........ ....

Correct packet is like

0000 00 1d 0f 0b 22 79 00 e0 22 fe b8 14 08 00 45 00 ...."y..

".....E.

0010 00 22 00 00 00 00 40 11 5d 24 0a 64 04 32 0a 64 ."....@.

]$.d.2.d

0020 04 ae 19 2b 82 55 00 0e 9d d6 24 4f 4b 23 39 61 ...+.U.. ..$OK#9a

0030 00 00 00 00 00 00 00 00 00 00 00 00 ........ ....

--- Sonic Zhang 2009-02-06 05:23:14

Fixed.

Make sure data are really written into registers before enabling DMA.

Otherwise, the EMAC dma controller may transfer out malformed packet. This patch

may also fix netperf bugs or scp bugs.

--- Mingquan Pan 2009-02-09 04:04:08

Yeah, this issue doesn't show up in latest kgdb ethernet tests. So close.

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