[#5287] kgdb kernel with write through policy on bf533 stamp would have dump info

Submitted By: Mingquan Pan

Open Date

2009-06-22 03:38:11

Priority:

Medium Assignee:

Sonic Zhang

Status:

Open Fixed In Release:

N/A

Found In Release:

N/A Release:

Category:

N/A Board:

N/A

Processor:

BF533 Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Fixed

Uboot version or rev.:

Toolchain version or rev.:

09r1-rc7

App binary format:

N/A

Summary: kgdb kernel with write through policy on bf533 stamp would have dump info

Details:

kgdb kernel with write through policy on bf533 stamp would have dump info.

## Booting kernel from Legacy Image at 02000000 ...

Image Name: Linux-2.6.28.10-ADI-2009R1-svn67

Created: 2009-06-16 18:02:41 UTC

Image Type: Blackfin Linux Kernel Image (gzip compressed)

Data Size: 4089856 Bytes = 3.9 MB

Load Address: 00001000

Entry Point: 0018f52c

Verifying Checksum ... OK

Uncompressing Kernel Image ... OK

Starting Kernel at = 0018f52c

Linux version 2.6.28.10-ADI-2009R1-svn6753 (test@uclinux75-bf533-stamp-wt) (gcc version 4.1.2 (ADI svn)) #4 Wed Jun 17 02:02:27 CST 2009

Warning: limiting memory to 56MB due to hardware anomaly 05000263

Board Memory: 128MB

Kernel Managed Memory: 128MB

Memory map:

fixedcode = 0x00000400-0x00000490

text = 0x00001000-0x0010cf60

rodata = 0x0010cf60-0x0015cee0

bss = 0x0015d000-0x001749c4

data = 0x001749c4-0x00184000

stack = 0x00182000-0x00184000

init = 0x00184000-0x007cc000

available = 0x007cc000-0x037ff000

DMA Zone = 0x07f00000-0x08000000

Hardware Trace Active and Enabled

Boot Mode: 0

Reset caused by Software reset

Compiled for ADSP-BF533 Rev 0.3

Blackfin Linux support by http://blackfin.uclinux.org/

Processor Speed: 398 MHz core clock and 79 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: 14223

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)

bfin-rtc: invalid date; resetting

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: 48788k/131072k RAM, (6432k init code, 1071k kernel code, 477k data, 1024k dma, 73280k reserved)

Calibrating delay loop... 790.52 BogoMIPS (lpj=1581056)

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: 64 KB (52 KB free)

net_namespace: 288 bytes

NET: Registered protocol family 16

Blackfin DMA Controller

stamp_init(): registering device resources

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 95

io scheduler noop registered

io scheduler anticipatory registered (default)

io scheduler cfq registered

Serial: Blackfin serial driver

bfin-uart.1: ttyBF0 at MMIO 0xffc00400 (irq = 21) is a BFIN-UART

brd: module loaded

smc91x.c: v1.1, sep 22 2004 by Nicolas Pitre <nico@cam.org>

eth0: SMC91C11xFD (rev 1) at 20300300 IRQ 40 [nowait]

eth0: Ethernet addr: f2:06:01:61:68:b5

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

eth0: link down

eth0: link up, 100Mbps, full-duplex, lpa 0x45E1

kgdb: Registered I/O driver kgdboe.

kgdboe: debugging over ethernet enabled

bfin-spi bfin-spi.0: Blackfin on-chip SPI Controller Driver, Version 1.0, regs_base@ffc00500, dma channel@5

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

TCP cubic registered

NET: Registered protocol family 17

rtc-bfin rtc-bfin: setting system clock to 1970-01-02 02:37:45 UTC (95865)

Freeing unused kernel memory: 6432k freed

dma_alloc_init: dma_page @ 0x007c9000 - 256 pages at 0x07f00000

_____________________________________

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| - http://blackfin.uclinux.org/

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

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

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

Have a lot of fun...

BusyBox v1.13.4 (2009-06-16 22:14:36 CST) built-in shell (msh)

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

root:/> version

kernel: Linux release 2.6.28.10-ADI-2009R1-svn6753, build #4 Wed Jun 17 02:02:27 CST 2009

toolchain: bfin-uclinux-gcc release gcc version 4.1.2 (ADI svn)

user-dist: release svn-8295, build #8 Wed Jun 17 02:01:20 CST 2009

root:/>

************** 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 0x8f9a: file arch/blackfin/kernel/kgdb_test.c, line 57.

Case 3 ...PASS

(gdb) c

Continuing.

Case 4 ...PASS

root:/> [New Thread 153]

[Switching to Thread 153]

Breakpoint 1, kgdb_test (name=0x10d9d0 "hello world!", len=12, count=85, z=16) at arch/blackfin/kernel/kgdb_test.c:57

Case 5 ...PASS

57 printk(KERN_DEBUG "kgdb name(%d): %s, %d, %d\n", len, name, count, z);

(gdb) hbreak 58

Hardware assisted breakpoint 2 at 0x8fbc: file arch/blackfin/kernel/kgdb_test.c, line 58.

(gdb)

Case 6 ...PASS

info b

Num Type Disp Enb Address What

1 breakpoint keep y 0x00008f9a in kgdb_test at arch/blackfin/kernel/kgdb_test.c:57

breakpoint already hit 1 time

2 hw breakpoint keep y 0x00008fbc in kgdb_test at arch/blackfin/kernel/kgdb_test.c:58

Case 7 ...PASS

(gdb) list

52 #endif

55 int kgdb_test(char *name, int len, int count, int z)

56 {

57 printk(KERN_DEBUG "kgdb name(%d): %s, %d, %d\n", len, name, count, z);

58 count = z;

59 return count;

60 }

(gdb)

Case 8 ...PASS

#0 kgdb_test (name=0x10d9d0 "hello world!", len=12, count=85, z=16) at arch/blackfin/kernel/kgdb_test.c:57

Case 9 ...PASS

#1 0x00008fec in test_proc_output (buf=0x1cf000 "") at arch/blackfin/kernel/kgdb_test.c:64

#2 0x00009016 in test_read_proc (page=0x1cf000 "", start=0x37d7e64, off=0, count=3072, eof=0x37d7e68, data=0x0) at arch/blackfin/kernel/kgdb_test.c:80

#3 0x0006ddc0 in proc_file_read (file=<value optimized out>, buf=0x31e1e8c "", nbytes=4096, ppos=0x37d7eec) at fs/proc/generic.c:120

#4 0x0006a0f4 in proc_reg_read (file=0x37d7eec, buf=0xc <Address 0xc out of bounds>, count=85, ppos=0x37d7eec) at fs/proc/inode.c:191

#5 0x00042bd0 in vfs_read (file=0xa8c2c0, buf=0x31e1e8c "", count=4096, pos=0x37d7eec) at fs/read_write.c:279

#6 0x00042e08 in sys_read (fd=<value optimized out>, buf=0x31e1e8c "", count=4096) at fs/read_write.c:368

#7 0xffa00960 in system_call () at /home/test/work/cruise/checkouts/uclinux-dist/linux-2.6.x/arch/blackfin/include/asm/current.h:17

(gdb) c

Continuing.

Breakpoint 2, kgdb_test (name=0x10d9d0 "hello world!", len=12, count=85, z=16) at arch/blackfin/kernel/kgdb_test.c:58

Case 10 ...PASS

58 count = z;

(gdb) cat /proc/kgdbtest

kgdb name(12): hello world!, 85, 16

Case 10 ...PASS

print z

$1 = 16

Case 12 ...PASS

(gdb) c

Continuing.

L1(before change) : data variable addr = 0xff800000, data value is 0

L1 : code function addr = 0xffa003b4

L1(after change) : data variable addr = 0xff800000, data value is 10

root:/>

Case 12 ...PASS

[New Thread 154]

[Switching to Thread 154]

Breakpoint 1, kgdb_test (name=0x10d9d0 "hello world!", len=12, count=85, z=16) at arch/blackfin/kernel/kgdb_test.c:57

57 printk(KERN_DEBUG "kgdb name(%d): %s, %d, %d\n", len, name, count, z);

(gdb) hbreak kgdb_l1_test

Hardware assisted breakpoint 3 at 0xffa003b8: file arch/blackfin/kernel/kgdb_test.c, line 30.

Case 13 ...PASS

(gdb) break 33

Breakpoint 4 at 0xffa0040c: file arch/blackfin/kernel/kgdb_test.c, line 33.

Case 14 ...PASS

(gdb) c

Continuing.

Breakpoint 2, kgdb_test (name=0x10d9d0 "hello world!", len=12, count=85, z=16) at arch/blackfin/kernel/kgdb_test.c:58

58 count = z;

(gdb) cat /proc/kgdbtest

kgdb name(12): hello world!, 85, 16

Case 14 ...PASS

Continuing.

Breakpoint 3, kgdb_l1_test () at arch/blackfin/kernel/kgdb_test.c:30

30 printk(KERN_ALERT "L1(before change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);

(gdb) print num1

$2 = 10

Case 15 ...PASS

(gdb) c

Continuing.

Breakpoint 4, kgdb_l1_test () at arch/blackfin/kernel/kgdb_test.c:33

33 printk(KERN_ALERT "L1(after change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);

(gdb) print num1

$3 = 20

Case 16 ...PASS

(gdb) L1(before change) : data variable addr = 0xff800000, data value is 10

L1 : code function addr = 0xffa003b4

Case 16 ...PASS

x/1xw 0xff808010

0xff808010: Cannot access memory at address 0xff808010

Case 17 ...PASS

(gdb) set *0xff808020 = 23

Cannot access memory at address 0xff808020

Case 18 ...PASS

(gdb) x/1xw 0xffc00400

0xffc00400: 0x000d000d

Case 19 ...PASS

(gdb) set *0xffe08100=0x456

(gdb) x/1xw 0xffe08100

0xffe08100: 0x00000456

Case 20 ...PASS

(gdb) d 1

(gdb) d 2

(gdb) info break

Num Type Disp Enb Address What

3 hw breakpoint keep y 0xffa003b8 in kgdb_l1_test at arch/blackfin/kernel/kgdb_test.c:30

breakpoint already hit 1 time

4 breakpoint keep y 0xffa0040c in kgdb_l1_test at arch/blackfin/kernel/kgdb_test.c:33

breakpoint already hit 1 time

Case 21 ...PASS

(gdb) info reg

r0 0x14 20

r1 0xffff 65535

r2 0xffffffff -1

r3 0xffffff68 -152

r4 0x37c6000 58482688

r5 0x0 0

r6 0x7fffffff 2147483647

r7 0x0 0

p0 0x1259 0x1259

p1 0x176df4 0x176df4

p2 0xff800000 0xff800000

p3 0x31e1e8c 0x31e1e8c

p4 0xc00 0xc00

p5 0x1000 0x1000

sp 0x37d7dfc 0x37d7dfc

fp 0x37d7e0c 0x37d7e0c

i0 0x8 8

i1 0xf 15

i2 0x0 0

i3 0x1150c0 1134784

m0 0x1 1

m1 0x0 0

m2 0x0 0

m3 0x0 0

b0 0x1b 27

b1 0x0 0

b2 0x0 0

b3 0x0 0

l0 0x0 0

l1 0x0 0

l2 0x0 0

l3 0x0 0

a0x 0x0 0

a0w 0x0 0

a1x 0x0 0

a1w 0x0 0

astat 0x2002000 33562624

rets 0xffa003f6 0xffa003f6 <kgdb_l1_test+66>

lc0 0x7 7

lt0 0x318c2fe 51954430

lb0 0x318c307 51954439

lc1 0x0 0

lt1 0x8dbdc 580572

lb1 0x8dbec 580588

cycles 0x0 0

cycles2 0x0 0

usp 0x31e1e48 0x31e1e48

seqstat 0x62001 401409

syscfg 0x6 6

reti 0xffa0040e -6290418

retx 0x480 1152

retn 0x37d7e00 58555904

rete 0x0 0

---Type <return> to continue, or q <return> to quit---

pc 0xffa0040c 0xffa0040c <kgdb_l1_test+88>

cc 0x0 0

text_addr 0x0 0

text_end_addr 0x0 0

data_addr 0x0 0

fdpic_exec 0x0 0

fdpic_interp 0x0 0

ipend 0x8030 32816

(gdb)

Case 22 ...PASS

disassemble

Dump of assembler code for function kgdb_l1_test:

0xffa003b4 <kgdb_l1_test+0>: LINK 0xc; /* (12) */

0xffa003b8 <kgdb_l1_test+4>: P2.H = 0xff80; /* (-128) P2=0x0xff800000 <num1> */

0xffa003bc <kgdb_l1_test+8>: P2.L = 0x0; /* ( 0) P2=0x0xff800000 <num1> */

0xffa003c0 <kgdb_l1_test+12>: R2 = [P2];

0xffa003c2 <kgdb_l1_test+14>: R0.H = 0x10; /* ( 16) R0=0x0x100000 <__xfrm4_init_tempsel+256>(1048576) */

0xffa003c6 <kgdb_l1_test+18>: R0.L = 0xd904; /* (-9980) R0=0x0x10d904(1104132) */

0xffa003ca <kgdb_l1_test+22>: R1.H = 0xff80; /* (-128) R1=0x0xff800000 <num1>(-8388608) */

0xffa003ce <kgdb_l1_test+26>: R1.L = 0x0; /* ( 0) R1=0x0xff800000 <num1>(-8388608) */

0xffa003d2 <kgdb_l1_test+30>: P2.H = 0x1; /* ( 1) P2=0x0x10000 <copy_process+1340> */

0xffa003d6 <kgdb_l1_test+34>: P2.L = 0x1750; /* (5968) P2=0x0x11750 <printk> */

0xffa003da <kgdb_l1_test+38>: CALL (P2);

0xffa003dc <kgdb_l1_test+40>: R0.H = 0x10; /* ( 16) R0=0x0x10d904(1104132) */

0xffa003e0 <kgdb_l1_test+44>: R0.L = 0xd948; /* (-9912) R0=0x0x10d948(1104200) */

0xffa003e4 <kgdb_l1_test+48>: R1.H = 0xffa0; /* (-96) R1=0x0xffa00000 <ret_from_fork>(-6291456) */

0xffa003e8 <kgdb_l1_test+52>: R1.L = 0x3b4; /* (948) R1=0x0xffa003b4 <kgdb_l1_test>(-6290508) */

0xffa003ec <kgdb_l1_test+56>: P2.H = 0x1; /* ( 1) P2=0x0x11750 <printk> */

0xffa003f0 <kgdb_l1_test+60>: P2.L = 0x1750; /* (5968) P2=0x0x11750 <printk> */

0xffa003f4 <kgdb_l1_test+64>: CALL (P2);

0xffa003f6 <kgdb_l1_test+66>: P2.H = 0xff80; /* (-128) P2=0x0xff801750 */

0xffa003fa <kgdb_l1_test+70>: P2.L = 0x0; /* ( 0) P2=0x0xff800000 <num1> */

0xffa003fe <kgdb_l1_test+74>: R0 = [P2];

0xffa00400 <kgdb_l1_test+76>: R0 += 0xa; /* ( 10) */

0xffa00402 <kgdb_l1_test+78>: P2.H = 0xff80; /* (-128) P2=0x0xff800000 <num1> */

0xffa00406 <kgdb_l1_test+82>: P2.L = 0x0; /* ( 0) P2=0x0xff800000 <num1> */

0xffa0040a <kgdb_l1_test+86>: [P2] = R0;

0xffa0040c <kgdb_l1_test+88>: P2.H = 0xff80; /* (-128) P2=0x0xff800000 <num1> */

0xffa00410 <kgdb_l1_test+92>: P2.L = 0x0; /* ( 0) P2=0x0xff800000 <num1> */

Get reg_addr_after1.

0xffa00414 <kgdb_l1_test+96>: R2 = [P2];

0xffa00416 <kgdb_l1_test+98>: R0.H = 0x10; /* ( 16) R0=0x0x10d948(1104200) */

0xffa0041a <kgdb_l1_test+102>: R0.L = 0xd96c; /* (-9876) R0=0x0x10d96c(1104236) */

0xffa0041e <kgdb_l1_test+106>: R1.H = 0xff80; /* (-128) R1=0x0xff8003b4(-8387660) */

0xffa00422 <kgdb_l1_test+110>: R1.L = 0x0; /* ( 0) R1=0x0xff800000 <num1>(-8388608) */

0xffa00426 <kgdb_l1_test+114>: P2.H = 0x1; /* ( 1) P2=0x0x10000 <copy_process+1340> */

0xffa0042a <kgdb_l1_test+118>: P2.L = 0x1750; /* (5968) P2=0x0x11750 <printk> */

0xffa0042e <kgdb_l1_test+122>: CALL (P2);

0xffa00430 <kgdb_l1_test+124>: UNLINK;

0xffa00434 <kgdb_l1_test+128>: RTS;

End of assembler dump.

(gdb) Find reg_addr_after1 .

Case 23 ...PASS

0xffa00410 33 printk(KERN_ALERT "L1(after change) : data variable addr = 0x%p, data value is %d\n", &num1, num1);

(gdb) info reg

r0 0x14 20

r1 0xffff 65535

r2 0xffffffff -1

r3 0xffffff68 -152

r4 0x37c6000 58482688

r5 0x0 0

r6 0x7fffffff 2147483647

r7 0x0 0

p0 0x1259 0x1259

p1 0x176df4 0x176df4

p2 0xff800000 0xff800000

p3 0x31e1e8c 0x31e1e8c

p4 0xc00 0xc00

p5 0x1000 0x1000

sp 0x37d7dfc 0x37d7dfc

fp 0x37d7e0c 0x37d7e0c

i0 0x8 8

i1 0xf 15

i2 0x0 0

i3 0x1150c0 1134784

m0 0x1 1

m1 0x0 0

m2 0x0 0

m3 0x0 0

b0 0x1b 27

b1 0x0 0

b2 0x0 0

b3 0x0 0

l0 0x0 0

l1 0x0 0

l2 0x0 0

l3 0x0 0

a0x 0x0 0

a0w 0x0 0

a1x 0x0 0

a1w 0x0 0

astat 0x2002000 33562624

rets 0xffa003f6 0xffa003f6 <kgdb_l1_test+66>

lc0 0x7 7

lt0 0x318c2fe 51954430

lb0 0x318c307 51954439

lc1 0x0 0

lt1 0x8dbdc 580572

lb1 0x8dbec 580588

cycles 0x0 0

cycles2 0x0 0

usp 0x31e1e48 0x31e1e48

seqstat 0x62010 401424

syscfg 0x6 6

reti 0xffa00410 -6290416

retx 0x480 1152

retn 0x37d7e00 58555904

rete 0x0 0

---Type <return> to continue, or q <return> to quit---

pc 0xffa00410 0xffa00410 <kgdb_l1_test+92>

cc 0x0 0

text_addr 0x0 0

text_end_addr 0x0 0

data_addr 0x0 0

fdpic_exec 0x0 0

fdpic_interp 0x0 0

ipend 0x8030 32816

(gdb)

Case 25 ...PASS

SI case pass!

print len

$4 = 0

Case 26 ...PASS

(gdb) c

Continuing.

Double Fault

Kernel OOPS in progress

Deferred Exception context

CURRENT PROCESS:

COMM=cat PID=154

CPU = 0

TEXT = 0x03180040-0x031c6980 DATA = 0x031c69a0-0x031d86d0

BSS = 0x031d86d0-0x031d9ff0 USER-STACK = 0x031e2f78

return address: [0x00009d7a]; contents of:

0x00009d50: 6501 5281 4e2a 320a 3200 e0b2 1003 0278

0x00009d60: 0000 0010 6302 5410 67f9 5451 6501 5281

0x00009d70: 4e2a 320a 3200 e0b2 1002 [0268] 0010 0000

0x00009d80: 6302 5410 67f9 5451 6501 5281 4e2a 320a

ADSP-BF533-0.3 398(MHz CCLK) 79(MHz SCLK) (mpu off)

Linux version 2.6.28.10-ADI-2009R1-svn6753

Built with gcc version 4.1.2 (ADI svn)

SEQUENCER STATUS: Not tainted

SEQSTAT: 00062027 IPEND: ffe02108 SYSCFG: 0006

EXCAUSE : 0x27

physical IVG3 asserted : <0xffa007c4> { _trap + 0x0 }

physical IVG8 asserted : <0xffa00e7c> { _evt_evt8 + 0x0 }

physical IVG13 asserted : <0xffa00f58> { _evt_evt13 + 0x0 }

logical irq 6 mapped : <0xffa003a0> { _timer_interrupt + 0x0 }

logical irq 14 mapped : <0x000b2b88> { _bfin_rtc_interrupt + 0x0 }

logical irq 21 mapped : <0x0009e890> { _bfin_serial_dma_rx_int + 0x0 }

logical irq 22 mapped : <0x0009ebf0> { _bfin_serial_dma_tx_int + 0x0 }

logical irq 40 mapped : <0x000a7e58> { _smc_interrupt + 0x0 }

RETE: <0x00000000> /* Maybe null pointer? */

RETN: <0x037d7bb4> /* kernel dynamic memory */

RETX: <0x00009d7a> { _blackfin_dcache_invalidate_range + 0x16 }

RETS: <0x0002df58> { _kgdb_flush_swbreak_addr + 0x18 }

PC : <0x00009d7a> { _blackfin_dcache_invalidate_range + 0x16 }

DCPLB_FAULT_ADDR: <0x00000000> /* Maybe null pointer? */

ICPLB_FAULT_ADDR: <0x00009d7a> { _blackfin_dcache_invalidate_range + 0x16 }

PROCESSOR STATE:

R0 : ffa00400 R1 : 00000021 R2 : 0002ffe1 R3 : fffffffe

R4 : 00000003 R5 : 0000100d R6 : 001688ac R7 : 00000001

P0 : 00000000 P1 : 0002ffe1 P2 : ffc00e08 P3 : 0016c754

P4 : 00008cc8 P5 : 001688b4 FP : 037d7bc0 SP : 037d7ad8

LB0: ffa01784 LT0: ffa01784 LC0: 00000000

LB1: 00009d7a LT1: 00009d7a LC1: 00000001

B0 : 0000001b L0 : 00000000 M0 : 00000001 I0 : 00000008

B1 : 00000000 L1 : 00000000 M1 : 00000000 I1 : 001724c0

B2 : 00000000 L2 : 00000000 M2 : 00000000 I2 : 00000000

B3 : 00000000 L3 : 00000000 M3 : 00000000 I3 : 001150c0

A0.w: 00000500 A0.x: 00000000 A1.w: 00000500 A1.x: 00000000

USP : 031e1e48 ASTAT: 02002020

Hardware Trace:

Kernel panic - not syncing: Double Fault - unrecoverable event

Last pass : kernel 6699, uclinux 8285, toolchain 09r1-6

fail : kernel 6753, uclinux 8295, toolchain 09r1-7

Follow-ups

--- Sonic Zhang 2009-06-30 04:51:41

Fixed.

L1 instruction SRAM is not cachable. Executing Flush, flushinv or iflush at

this address region on bf533 v0.3 triggers double fault exception. Although no

double fault on other bfin chips, it is safe not to do it.

--- Robin Getz 2009-06-30 13:55:49

Sonic:

Either this is a hardware anomaly - or something else is going on. Since it is

not on the anomaly list - we need to assume (until someone in design verifies it

needs to be added) it is something else).

You should be able to execute these instructions (Flush, flushinv. iflush or

prefetch) on any memory location - if it is specific to 0.3 silicon, that should

be ifdef'ed so people understand what the cause is.

I see something wrong with prefetch - but not anything else when I added them

to traps_test.

3 0x00 flush l1_instruction

13 0x00 iflush l1_instruction

27 0x00 flushinv l1_instruction

All seem to work with out causing a EVT3 event from userspace... - so I think

this is something else....

-Robin

--- Sonic Zhang 2009-06-30 22:58:18

Are you running the trap_test with WT cache is selected on bf533 v0.3?

--- Sonic Zhang 2009-06-30 23:01:18

In addition, did you run trap_test on 2009R1 branch?

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[#5287] kgdb kernel with write through policy on bf533 stamp would have dump info