[meta-ti] ti81xx-psp-linux-2.6.37: broken kernel with gcc > 4.5
Thilo Fromm
fromm at dresearch-fe.de
Fri May 18 05:33:03 PDT 2012
Hello *.*,
sorry for the cross-post (openembedded-devel, meta-ti), I think this
affects both projects one way or the other.
Recently, meta-openembedded/toolchain-layer removed gcc-4.5. This
means with oe-core + meta-oe you now can choose between gcc-4.6 and
gcc-4.7. However, both compilers break the kernel we're using
(ti81xx-psp-linux-2.6.37).
Firstly, it is necessary to add the compiler flag
"-mno-unaligned-access" to the kernel build, or else the kernel would
not boot at all[1]. After adding this flag (e.g. by setting '
KERNEL_CC_append += "-mno-unaligned-access " ' in the kernel recipe)
the kernel boots but fails with a NULL pointer access before it
reaches user space (see boot log at [2]).
With the departure of gcc-4.5 there's currently no way to build a
working kernel for a TI dm81xx system.
Steps to reproduce the issue:
0. First you'll need a ti8148-evm board to test the kernel on
1. check out our layer configuration:
git clone git://github.com/DFE/HidaV.git; cd HidaV
2. get the other layers, init build env:
. ./hidav-init .
3. disable gcc-4.5 for the build:
sed -i -e 's/^ANGSTROM_GCC_VERSION/# ANGSTROM_GCC_VERSION/'
meta-hidav/conf/machine/hidav.conf
4. build the kernel:
bitbake virtual/linux
5. Boot the kernel on your ti8148-evm evaluation board; see it crash
Just to stress my point once more: we currently have no way to build a
sane kernel for TI 8148 based systems with latest oe-core, meta-oe,
and Angstrom.
Regards,
Thilo
Appendix
--------------
[1] <http://git.freesmartphone.org/?p=linux-2.6.git;a=commit;h=78ffc81db8911acdabd026ad3fdefa20b4e34e52>
[2] Faulty Kernel Boot Log:
---------- SNIPP ----------
Uncompressing Linux... done, booting the kernel.
[ 0.000000] Linux version 2.6.37
(maniac at bfg9000.internal.dresearch-fe.de) (gcc version 4.6.4 20120303
(prerelease) (GCC) ) #2 Fri May 18 13:10:18 CEST 2012
[ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7f
[ 0.000000] CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache
[ 0.000000] Machine: ti8148evm
[ 0.000000] vram size = 52428800 at 0x0
[ 0.000000] reserved size = 52428800 at 0x0
[ 0.000000] FB: Reserving 52428800 bytes SDRAM for VRAM
[ 0.000000] Memory policy: ECC disabled, Data cache writeback
[ 0.000000] OMAP chip is TI8148 2.0
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on.
Total pages: 247296
[ 0.000000] Kernel command line: console=ttyO0,115200n8 rootwait
root=/dev/mmcblk0p2 ro rootfstype=ext4 mem=1024M earlyprink vram=50M
ip=off noinitrd user_debug=255 systemd.log_target=kmsg
[ 0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
[ 0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
[ 0.000000] Memory: 974MB = 974MB total
[ 0.000000] Memory: 982772k/982772k available, 65804k reserved,
210944K highmem
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
[ 0.000000] fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
[ 0.000000] DMA : 0xffc00000 - 0xffe00000 ( 2 MB)
[ 0.000000] vmalloc : 0xf0800000 - 0xf8000000 ( 120 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xf0000000 ( 768 MB)
[ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
[ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
[ 0.000000] .init : 0xc0008000 - 0xc0052000 ( 296 kB)
[ 0.000000] .text : 0xc0052000 - 0xc04d2000 (4608 kB)
[ 0.000000] .data : 0xc04d2000 - 0xc05154e0 ( 270 kB)
[ 0.000000] SLUB: Genslabs=11, HWalign=64, Order=0-3, MinObjects=0,
CPUs=1, Nodes=1
[ 0.000000] NR_IRQS:407
[ 0.000000] IRQ: Found an INTC at 0xfa200000 (revision 5.0) with
128 interrupts
[ 0.000000] Total of 128 interrupts on 1 active controller
[ 0.000000] GPMC revision 6.0
[ 0.000000] Trying to install interrupt handler for IRQ400
[ 0.000000] Trying to install interrupt handler for IRQ401
[ 0.000000] Trying to install interrupt handler for IRQ402
[ 0.000000] Trying to install interrupt handler for IRQ403
[ 0.000000] Trying to install interrupt handler for IRQ404
[ 0.000000] Trying to install interrupt handler for IRQ405
[ 0.000000] Trying to install interrupt handler for IRQ406
[ 0.000000] Trying to install type control for IRQ407
[ 0.000000] Trying to set irq flags for IRQ407
[ 0.000000] OMAP clockevent source: GPTIMER1 at 20000000 Hz
[ 0.000000] Console: colour dummy device 80x30
[ 0.000000] Calibrating delay loop... 598.01 BogoMIPS (lpj=2990080)
[ 0.220000] pid_max: default: 32768 minimum: 301
[ 0.230000] Security Framework initialized
[ 0.230000] Mount-cache hash table entries: 512
[ 0.230000] CPU: Testing write buffer coherency: ok
[ 0.230000] ftrace: allocating 14049 entries in 42 pages
[ 0.240000] devtmpfs: initialized
[ 0.250000] omap_voltage_early_init: voltage driver support not added
[ 0.250000] regulator: core version 0.5
[ 0.250000] regulator: dummy:
[ 0.250000] NET: Registered protocol family 16
[ 0.250000] OMAP GPIO hardware version 0.1
[ 0.250000] OMAP GPIO hardware version 0.1
[ 0.250000] OMAP GPIO hardware version 0.1
[ 0.250000] OMAP GPIO hardware version 0.1
[ 0.260000] omap_mux_init: Add partition: #1: core, flags: 4
[ 0.270000] registered ti814x_vpss device
[ 0.270000] registered TI814x on-chip HDMI device
[ 0.280000] registered ti81xx_vidout device
[ 0.290000] Debugfs: Only enabling/disabling deep sleep and wakeup
timer is supported now
[ 0.290000] ti81xx_pcie: Invoking PCI BIOS...
[ 0.290000] ti81xx_pcie: Setting up Host Controller...
[ 0.290000] ti81xx_pcie: Register base mapped @0xf0820000
[ 0.400000] ti81xx_pcie: Starting PCI scan...
[ 0.400000] PCI: bus0: Fast back to back transfers enabled
[ 0.410000] bio: create slab <bio-0> at 0
[ 0.410000] vgaarb: loaded
[ 0.410000] SCSI subsystem initialized
[ 0.420000] usbcore: registered new interface driver usbfs
[ 0.420000] usbcore: registered new interface driver hub
[ 0.420000] usbcore: registered new device driver usb
[ 0.420000] registerd cppi-dma Intr @ IRQ 17
[ 0.420000] Cppi41 Init Done
[ 0.420000] omap_i2c omap_i2c.1: bus 1 rev4.0 at 100 kHz
[ 0.420000] pcf857x 1-0021: gpios 128..143 on a pcf8575
[ 0.420000] omap_i2c omap_i2c.3: bus 3 rev4.0 at 100 kHz
[ 0.430000] Switching to clocksource gp timer
[ 0.490000] musb-hdrc: version 6.0, host, debug=0
[ 0.500000] musb-hdrc musb-hdrc.0: dma type: dma-cppi41
[ 0.500000] musb-hdrc musb-hdrc.0: MUSB HDRC host driver
[ 0.500000] musb-hdrc musb-hdrc.0: new USB bus registered, assigned
bus number 1
[ 0.500000] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 0.500000] usb usb1: New USB device strings: Mfr=3, Product=2,
SerialNumber=1
[ 0.500000] usb usb1: Product: MUSB HDRC host driver
[ 0.500000] usb usb1: Manufacturer: Linux 2.6.37 musb-hcd
[ 0.500000] usb usb1: SerialNumber: musb-hdrc.0
[ 0.500000] hub 1-0:1.0: USB hub found
[ 0.500000] hub 1-0:1.0: 1 port detected
[ 0.500000] musb-hdrc musb-hdrc.0: USB Host mode controller at
f081e000 using DMA, IRQ 18
[ 0.500000] musb-hdrc musb-hdrc.1: dma type: dma-cppi41
[ 0.500000] musb-hdrc musb-hdrc.1: MUSB HDRC host driver
[ 0.500000] musb-hdrc musb-hdrc.1: new USB bus registered, assigned
bus number 2
[ 0.500000] usb usb2: New USB device found, idVendor=1d6b, idProduct=0002
[ 0.500000] usb usb2: New USB device strings: Mfr=3, Product=2,
SerialNumber=1
[ 0.500000] usb usb2: Product: MUSB HDRC host driver
[ 0.500000] usb usb2: Manufacturer: Linux 2.6.37 musb-hcd
[ 0.500000] usb usb2: SerialNumber: musb-hdrc.1
[ 0.500000] hub 2-0:1.0: USB hub found
[ 0.500000] hub 2-0:1.0: 1 port detected
[ 0.510000] musb-hdrc musb-hdrc.1: USB Host mode controller at
f0826800 using DMA, IRQ 19
[ 0.510000] NET: Registered protocol family 2
[ 0.510000] IP route cache hash table entries: 32768 (order: 5, 131072 bytes)
[ 0.510000] TCP established hash table entries: 131072 (order: 8,
1048576 bytes)
[ 0.510000] TCP bind hash table entries: 65536 (order: 6, 262144 bytes)
[ 0.510000] TCP: Hash tables configured (established 131072 bind 65536)
[ 0.510000] TCP reno registered
[ 0.510000] UDP hash table entries: 512 (order: 1, 8192 bytes)
[ 0.510000] UDP-Lite hash table entries: 512 (order: 1, 8192 bytes)
[ 0.510000] NET: Registered protocol family 1
[ 0.510000] PMU: registered new PMU device of type 0
[ 0.510000] omap-iommu omap-iommu.0: ducati registered
[ 0.510000] omap-iommu omap-iommu.1: sys registered
[ 0.610000] highmem bounce pool size: 64 pages
[ 0.630000] VFS: Disk quotas dquot_6.5.2
[ 0.630000] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
[ 0.640000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.640000] aufs 2.2-standalone.tree-37-20120326
[ 0.640000] msgmni has been set to 1507
[ 0.640000] Block layer SCSI generic (bsg) driver version 0.4
loaded (major 253)
[ 0.640000] io scheduler noop registered
[ 0.640000] io scheduler deadline registered
[ 0.640000] io scheduler cfq registered (default)
[ 0.640000] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[ 0.650000] omap_uart.0: ttyO0 at MMIO 0x48020000 (irq = 72) is a OMAP UART0
[ 1.360000] console [ttyO0] enabled
[ 1.370000] omap_uart.1: ttyO1 at MMIO 0x48022000 (irq = 73) is a OMAP UART1
[ 1.380000] omap_uart.2: ttyO2 at MMIO 0x48024000 (irq = 74) is a OMAP UART2
[ 1.380000] omap_uart.3: ttyO3 at MMIO 0x481a6000 (irq = 44) is a OMAP UART3
[ 1.390000] omap_uart.4: ttyO4 at MMIO 0x481a8000 (irq = 45) is a OMAP UART4
[ 1.400000] omap_uart.5: ttyO5 at MMIO 0x481aa000 (irq = 46) is a OMAP UART5
[ 1.430000] brd: module loaded
[ 1.450000] loop: module loaded
[ 1.450000] ahci ahci.0: forcing PORTS_IMPL to 0x1
[ 1.460000] ahci ahci.0: AHCI 0001.0300 32 slots 1 ports 3 Gbps 0x1
impl platform mode
[ 1.460000] ahci ahci.0: flags: ncq sntf pm led clo only pmp pio
slum part ccc apst
[ 1.480000] scsi0 : ahci_platform
[ 1.480000] ata1: SATA max UDMA/133 mmio [mem
0x4a140000-0x4a150fff] port 0x100 irq 16
[ 1.490000] omap2-nand driver initializing
[ 1.490000] NAND device: Manufacturer ID: 0x2c, Chip ID: 0xcc (Micron )
[ 1.500000] Creating 7 MTD partitions on "omap2-nand.0":
[ 1.510000] 0x000000000000-0x000000100000 : "bootloader"
[ 1.520000] 0x000000100000-0x000000200000 : "bootconfig"
[ 1.530000] 0x000000200000-0x000000c00000 : "kernel1"
[ 1.540000] blockrom0: 1024 KiB; EBs 8 user, 0 spare,
0 mgmt, 0 bad, 8 toal
[ 1.550000] blockrom1: 1024 KiB; EBs 8 user, 0 spare,
0 mgmt, 0 bad, 8 toal
[ 1.570000] 0x000000c00000-0x000001600000 : "kernel2"
[ 1.580000] 0x000001600000-0x000007a00000 : "rootfs1"
[ 1.630000] blockrom3: 10240 KiB; EBs 80 user, 0 spare,
0 mgmt, 0 bad, 80 toal
[ 1.650000] blockrom2: 10240 KiB; EBs 80 user, 0 spare,
0 mgmt, 0 bad, 80 toal
[ 1.700000] 0x000007a00000-0x00000de00000 : "rootfs2"
[ 1.750000] blockrom4: 102272 KiB; EBs 799 user, 0 spare,
0 mgmt, 1 bad, 800 toal
[ 1.800000] blockrom5: 101760 KiB; EBs 795 user, 0 spare,
0 mgmt, 5 bad, 800 toal
[ 1.810000] 0x00000de00000-0x000020000000 : "application_fs"
[ 1.940000] ata1: SATA link down (SStatus 0 SControl 300)
[ 2.070000] blockrom6: 295296 KiB; EBs 2307 user, 0 spare,
0 mgmt, 13 bad, 2320 toal
[ 2.120000] davinci_mdio davinci_mdio.0: davinci mdio revision 1.6
[ 2.120000] davinci_mdio davinci_mdio.0: detected phy mask fffffffc
[ 2.130000] davinci_mdio.0: probed
[ 2.130000] davinci_mdio davinci_mdio.0: phy[0]: device 0:00, driver unknown
[ 2.140000] davinci_mdio davinci_mdio.0: phy[1]: device 0:01, driver unknown
[ 2.150000] usbcore: registered new interface driver cdc_ether
[ 2.160000] usbcore: registered new interface driver dm9601
[ 2.160000] usbcore: registered new interface driver cdc_acm
[ 2.170000] cdc_acm: v0.26:USB Abstract Control Model driver for
USB modems and ISDN adapters
[ 2.180000] Initializing USB Mass Storage driver...
[ 2.180000] usbcore: registered new interface driver usb-storage
[ 2.190000] USB Mass Storage support registered.
[ 2.190000] mice: PS/2 mouse device common for all mice
[ 2.420000] qt602240_ts 1-004a: Family ID: 128 Variant ID: 1
Version: 22 Build: 171
[ 2.430000] qt602240_ts 1-004a: Matrix X Size: 18 Matrix Y Size: 12
Object Num: 17
[ 2.440000] input: AT42QT602240/ATMXT224 Touchscreen as
/devices/platform/omap/omap_i2c.1/i2c-1/1-004a/input/input0
[ 2.450000] omap_rtc omap_rtc: rtc core: registered omap_rtc as rtc0
[ 2.460000] i2c /dev entries driver
[ 2.460000] OMAP Watchdog Timer Rev 0x00: initial timeout 60 sec
[ 2.470000] usbcore: registered new interface driver usbhid
[ 2.480000] usbhid: USB HID core driver
[ 2.480000] Unable to handle kernel NULL pointer dereference at
virtual address 00000002
[ 2.490000] pgd = c0004000
[ 2.490000] [00000002] *pgd=00000000
[ 2.500000] Internal error: Oops: 5 [#1]
[ 2.500000] last sysfs file:
[ 2.500000] Modules linked in:
[ 2.500000] CPU: 0 Not tainted (2.6.37 #2)
[ 2.500000] PC is at strcmp+0xc/0x40
[ 2.500000] LR is at omap_mbox_get+0x44/0x1d8
[ 2.500000] pc : [<c0212b6c>] lr : [<c00784ec>] psr: a0000013
[ 2.500000] sp : ef85bef8 ip : ef85bf08 fp : ef85bf04
[ 2.500000] r10: c03246f4 r9 : 00000000 r8 : 00000040
[ 2.500000] r7 : ef85bf44 r6 : c046bc75 r5 : c050ba68 r4 : c04e8d14
[ 2.500000] r3 : 00000064 r2 : 00000076 r1 : c046bc75 r0 : 00000002
[ 2.500000] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM
Segment kernel
[ 2.500000] Control: 10c5387d Table: 80004019 DAC: 00000017
[ 2.500000] Process swapper (pid: 1, stack limit = 0xef85a2e8)
[ 2.500000] Stack: (0xef85bef8 to 0xef85c000)
[ 2.500000] bee0:
ef85bf2c ef85bf08
[ 2.500000] bf00: c00784ec c0212b6c c0320944 c0212b6c 00000000
c050ba0c c050ba08 00000000
[ 2.500000] bf20: ef85bf74 ef85bf30 c0324854 c00784b4 00000000
00000000 00000020 ffffffff
[ 2.500000] bf40: 00000001 00000000 00000000 c002ec58 c00285c8
00000000 00000013 00000000
[ 2.500000] bf60: 00000000 00000000 ef85bfa4 ef85bf78 c0028604
c0324650 ef85a000 c002ec58
[ 2.500000] bf80: c00285c8 00000000 00000013 00000000 00000000
00000000 ef85bfdc ef85bfa8
[ 2.500000] bfa0: c0052450 c00285d4 ef85bfc4 00000196 c04f5904
c00c07d0 c002ec58 c002ecdc
[ 2.500000] bfc0: c00841cc 00000013 00000000 00000000 ef85bff4
ef85bfe0 c0008d20 c0052394
[ 2.500000] bfe0: 00000000 c0008c80 00000000 ef85bff8 c00841cc
c0008c8c 69782969 7979f961
[ 2.500000] Backtrace:
[ 2.500000] [<c0212b60>] (strcmp+0x0/0x40) from [<c00784ec>]
(omap_mbox_get+0x44/0x1d8)
[ 2.500000] [<c00784a8>] (omap_mbox_get+0x0/0x1d8) from
[<c0324854>] (notify_shm_drv_setup+0x210/0x2f0)
[ 2.500000] r6:00000000 r5:c050ba08 r4:c050ba0c
[ 2.500000] [<c0324644>] (notify_shm_drv_setup+0x0/0x2f0) from
[<c0028604>] (notify_init+0x3c/0x2b0)
[ 2.500000] [<c00285c8>] (notify_init+0x0/0x2b0) from [<c0052450>]
(do_one_initcall+0xc8/0x1a0)
[ 2.500000] [<c0052388>] (do_one_initcall+0x0/0x1a0) from
[<c0008d20>] (kernel_init+0xa0/0x14c)
[ 2.500000] r9:00000000 r8:00000000 r7:00000013 r6:c00841cc r5:c002ecdc
[ 2.500000] r4:c002ec58
[ 2.500000] [<c0008c80>] (kernel_init+0x0/0x14c) from [<c00841cc>]
(do_exit+0x0/0x658)
[ 2.500000] r5:c0008c80 r4:00000000
[ 2.500000] Code: e89da800 e1a0c00d e92dd800 e24cb004 (e4d03001)
[ 2.730000] ---[ end trace ffdc45ac5a6696b9 ]---
[ 2.740000] Kernel panic - not syncing: Attempted to kill init!
[ 2.750000] Backtrace:
[ 2.750000] [<c005ad34>] (dump_backtrace+0x0/0x118) from
[<c03a5014>] (dump_stack+0x20/0x24)
[ 2.760000] r6:ef85a000 r5:c04ec558 r4:c0515ce0 r3:07730fa7
[ 2.760000] [<c03a4ff4>] (dump_stack+0x0/0x24) from [<c03a522c>]
(panic+0x64/0x184)
[ 2.770000] [<c03a51c8>] (panic+0x0/0x184) from [<c008423c>]
(do_exit+0x70/0x658)
[ 2.780000] r3:c04ec558 r2:ef85bd18 r1:0000002e r0:c046e2e2
[ 2.780000] r7:ef85c000
[ 2.790000] [<c00841cc>] (do_exit+0x0/0x658) from [<c005b25c>]
(die+0x1a4/0x1d0)
[ 2.790000] r7:00000001
[ 2.800000] [<c005b0b8>] (die+0x0/0x1d0) from [<c03a507c>]
(__do_kernel_fault.part.1+0x64/0x84)
[ 2.810000] r8:00000005 r7:ef85beb0 r6:00000000 r5:00000005 r4:00000002
[ 2.810000] [<c03a5018>] (__do_kernel_fault.part.1+0x0/0x84) from
[<c03ac66c>] (do_page_fault+0x204/0x220)
[ 2.820000] r7:00000000 r3:ef85beb0
[ 2.830000] [<c03ac468>] (do_page_fault+0x0/0x220) from
[<c03ac6b4>] (do_translation_fault+0x2c/0xb0)
[ 2.840000] [<c03ac688>] (do_translation_fault+0x0/0xb0) from
[<c0052278>] (do_DataAbort+0x44/0xa8)
[ 2.850000] r7:ef85beb0 r6:00000002 r5:c04d6510 r4:00000005
[ 2.850000] [<c0052234>] (do_DataAbort+0x0/0xa8) from [<c03aa56c>]
(__dabt_svc+0x4c/0x60)
[ 2.860000] Exception stack(0xef85beb0 to 0xef85bef8)
[ 2.870000] bea0: 00000002
c046bc75 00000076 00000064
[ 2.870000] bec0: c04e8d14 c050ba68 c046bc75 ef85bf44 00000040
00000000 c03246f4 ef85bf04
[ 2.880000] bee0: ef85bf08 ef85bef8 c00784ec c0212b6c a0000013 ffffffff
[ 2.890000] r7:ef85bf44 r6:c046bc75 r5:ef85bee4 r4:ffffffff
[ 2.900000] [<c0212b60>] (strcmp+0x0/0x40) from [<c00784ec>]
(omap_mbox_get+0x44/0x1d8)
[ 2.900000] [<c00784a8>] (omap_mbox_get+0x0/0x1d8) from
[<c0324854>] (notify_shm_drv_setup+0x210/0x2f0)
[ 2.910000] r6:00000000 r5:c050ba08 r4:c050ba0c
[ 2.920000] [<c0324644>] (notify_shm_drv_setup+0x0/0x2f0) from
[<c0028604>] (notify_init+0x3c/0x2b0)
[ 2.930000] [<c00285c8>] (notify_init+0x0/0x2b0) from [<c0052450>]
(do_one_initcall+0xc8/0x1a0)
[ 2.940000] [<c0052388>] (do_one_initcall+0x0/0x1a0) from
[<c0008d20>] (kernel_init+0xa0/0x14c)
[ 2.950000] r9:00000000 r8:00000000 r7:00000013 r6:c00841cc r5:c002ecdc
[ 2.950000] r4:c002ec58
[ 2.960000] [<c0008c80>] (kernel_init+0x0/0x14c) from [<c00841cc>]
(do_exit+0x0/0x658)
[ 2.970000] r5:c0008c80 r4:00000000
---------- SNIPP ----------
--
Dipl.-Ing (FH) Thilo Fromm, MSc., Embedded Systems Architect
DResearch Fahrzeugelektronik GmbH
Otto-Schmirgal-Str. 3, D-10319 Berlin, Germany
Tel: +49 (30) 515 932 228 mailto:fromm at dresearch-fe.de
Fax: +49 (30) 515 932 77 http://www.dresearch.de
Amtsgericht: Berlin Charlottenburg, HRB 130120 B
Ust.-IDNr. DE273952058
Geschäftsführer: Dr. M. Weber, W. Mögle
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