RE: [PATCH v2] Porting barebox to a new SoC

[Lior Weintraub <liorw@pliops.com>]

Hello Ahmad,

I am happy to share with your that the issue was resolved.
All because of 1 bit on the GIC Distributer Control register which allow non-secure to config the GIC.

From the GIC-600 manual:
----------------------------------------------------------------------------------------------------------------------------------------
Setting the Disable Security (DS) bit to 1 in the GICD_CTLR register removes the security support of
the GIC-600. It can be set by Secure software during the boot sequence or configured to be always set
when you configure the design using the parameter ds_value. When the system has no concept of
security, you must set GICD_CTLR.DS to allow access to important registers.

If you run software without security awareness on a system that supports security, the Secure boot code
can set DS before switching to a Non-secure Exception level to run the software. This enables you to
program the GIC-600 from any Exception level and use two interrupt groups, Group 0 and Group 1, so
that interrupts can target both the FIQ and IRQ handlers on a core.
----------------------------------------------------------------------------------------------------------------------------------------

I wonder if I can suggest a patch to Linux kernel that will check this bit and report some kind of error message to the user.
This kind of error message could have saved me a lot of time.
I was under the impression that I don't need to know about GIC configuration because Linux has a driver for it.

Cheers,
Lior.  

> -----Original Message-----
> From: Ahmad Fatoum <a.fatoum@pengutronix.de>
> Sent: Thursday, September 7, 2023 12:36 PM
> To: Lior Weintraub <liorw@pliops.com>
> Cc: Ahmad Fatoum <ahmad@a3f.at>; barebox@lists.infradead.org
> Subject: Re: [PATCH v2] Porting barebox to a new SoC
> 
> CAUTION: External Sender
> 
> Hello Lior,
> 
> On 07.09.23 11:07, Lior Weintraub wrote:
> > Hi Ahmad,
> >
> > I haven't posted a question yet. Will CC you when doing so.
> > In the meantime, I am trying to find the root cause on my own (with lower
> priority).
> > Found and fixed 2 potential issues but those didn't solve the stuck:
> > 1. Linux default configure 39 VA bits. Changed it now to 48.
> > 2. Our DT had declared the following memory section:
> >       memory@0 {
> >               device_type = "memory";
> >               reg = < 0x00 0x00000000 0x0 0x30000000  /* 512M + 256M*/
> >                               0xC0 0x00000000 0x0 0x00400000 >;       /* 4M */
> 
> I don't think that's correct. If you have multiple memory banks, you should
> have multiple memory@ nodes.
> 
> >       };
> > Then I saw on Linux prints:
> > Early memory node ranges
> >   node   0: [mem 0x0000000000000000-0x000000002fffffff]
> >   node   0: [mem 0x000000c000000000-0x000000c0003fffff]
> > Initmem setup node 0 [mem 0x0000000000000000-0x000000c0003fffff]
> >
> > That looked suspicious as node 0 took the whole range without considering
> the gap.
> > Maybe it is harmless but in any case we've removed the SRAM 4MB part
> because anyway the Linux will have nothing to do with it as it will only use the
> DRAM resources.
> 
> Generally, you shouldn't describe SRAM as /memory, especially if TF-A is
> sitting there
> as you risk Linux clobbering it. There's a mmio-sram binding, which you can
> use
> if you want to give drivers access to SRAM (e.g. for faster DMA), but you
> shouldn't
> register it as general-purpose /memory.
> 
> > The new print looks now:
> > Movable zone start for each node
> > Early memory node ranges
> >   node   0: [mem 0x0000000000000000-0x000000002fffffff]
> > Initmem setup node 0 [mem 0x0000000000000000-0x000000002fffffff]
> 
> That looks better, yes. I assume you load Linux to some address at the
> beginning of this region? SZ_2M?
> 
> 
> > I am looking for ways to debug the MMU settings that Linux is using because
> I suspect that the writes to the GICv3 are not mapped correctly.
> > Thought maybe the fact that our GIC is located on 0xE0_0000_0000 causes
> a bug.
> > Changed it's address on the QEMU and DT to be 0x00_E000_0000 but this
> didn't help.
> >
> > Tried to print MMU mapping but as you probably know it's hard to do while
> MMU is enabled :-)
> 
> There's kernel_page_tables in debugfs. I know you don't reach that far, but
> maybe
> you can hack something together using an intermediate function to dump
> what's
> relevant to you.
> 
> > Tried to comment out the MMU enable code but that also caused a crash
> because Linux tried to access the VA.
> > Tried to use the Linux function __virt_to_phys in order to see which PA is
> used when the GICv3 is accessed using the following code:
> >     uint64_t dist_base_phys_add = __virt_to_phys(gic_data.dist_base);
> >     uint64_t redist_base_phys_add =
> __virt_to_phys(gic_data.redist_regions[0].redist_base);
> >     pr_info("dist_base_phys_add   = 0x%llx\n",dist_base_phys_add);
> >     pr_info("redist_base_phys_add = 0x%llx\n",redist_base_phys_add);
> >
> > It printed out strange addresses:
> > GICv3: dist_base_phys_add   = 0x8aa0000
> > GICv3: redist_base_phys_add = 0x8ac0000
> 
> The PA should be returned by of_iomap and passed to io_remap. Do you
> suspect
> something changes its value?
> 
> 
> > Saw there is an option to enable CONFIG_DEBUG_VIRTUAL and this showed
> an error message when I used the __virt_to_phys function:
> > ------------[ cut here ]------------
> > virt_to_phys used for non-linear address: (____ptrval____)
> (0xffff800080aa0000)
> > WARNING: CPU: 0 PID: 0 at arch/arm64/mm/physaddr.c:12
> __virt_to_phys+0x54/0x70
> > Modules linked in:
> > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.5.0 #86
> > Hardware name: Pliops Spider MK-I EVK (DT)
> > pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> > pc : __virt_to_phys+0x54/0x70
> > lr : __virt_to_phys+0x54/0x70
> > sp : ffff8000808f3de0
> > x29: ffff8000808f3de0 x28: 0000000008759074 x27: 0000000007a30dd8
> > x26: ffff8000807b5008 x25: 0000000000000019 x24: ffff8000809cc398
> > x23: ffff800080aa0000 x22: ffff8000809cc018 x21: ffff800080ac0000
> > x20: ffff8000806dfff0 x19: ffff800080aa0000 x18: ffffffffffffffff
> > x17: ffff000000089400 x16: ffff000000089200 x15: ffff8001008f373d
> > x14: 0000000000000001 x13: ffff8000808f3740 x12: ffff8000808f36d0
> > x11: ffff8000808f36c8 x10: 000000000000000a x9 : ffff8000808f3650
> > x8 : ffff80008090af28 x7 : ffff8000808f3c00 x6 : 000000000000000c
> > x5 : 0000000000000037 x4 : 0000000000000000 x3 :
> 0000000000000000
> > x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff8000808fd0c0
> > Call trace:
> >  __virt_to_phys+0x54/0x70
> >  dump_gic_regs+0x40/0x168
> >  start_kernel+0x260/0x5cc
> >  __primary_switched+0xb4/0xbc
> > ---[ end trace 0000000000000000 ]---
> 
> Ye, I don't think virt_to_phys is meant to be used for arbitrary addresses.
> 
> > So as you can see, I am trying to guess my way :-).
> > Not really know what I am doing but I think that is the best way to learn.
> 
> That for sure. Good luck and keep me posted. :)
> 
> Cheers,
> Ahmad
> 
> >
> > Cheers,
> > Lior.
> >
> >> -----Original Message-----
> >> From: Ahmad Fatoum <a.fatoum@pengutronix.de>
> >> Sent: Thursday, September 7, 2023 11:33 AM
> >> To: Lior Weintraub <liorw@pliops.com>
> >> Cc: Ahmad Fatoum <ahmad@a3f.at>; barebox@lists.infradead.org
> >> Subject: Re: [PATCH v2] Porting barebox to a new SoC
> >>
> >> CAUTION: External Sender
> >>
> >> Hello Lior,
> >>
> >> On 22.08.23 10:48, Lior Weintraub wrote:
> >>> Thanks Ahmad, I Will try to post same question on Linux mailing list.
> >>
> >> I am curious to follow the discussion. Did you already post somewhere?
> >> I can't find a recent mail on lore.kernel.org.
> >>
> >> Feel free to Cc me when you post.
> >>
> >> Cheers,
> >> Ahmad
> >>
> >>>
> >>>> -----Original Message-----
> >>>> From: Ahmad Fatoum <a.fatoum@pengutronix.de>
> >>>> Sent: Tuesday, August 22, 2023 11:01 AM
> >>>> To: Lior Weintraub <liorw@pliops.com>
> >>>> Cc: Ahmad Fatoum <ahmad@a3f.at>; barebox@lists.infradead.org
> >>>> Subject: Re: [PATCH v2] Porting barebox to a new SoC
> >>>>
> >>>> CAUTION: External Sender
> >>>>
> >>>> Hello Lior,
> >>>>
> >>>> On 03.08.23 13:17, Lior Weintraub wrote:
> >>>>> Hi Ahmad,
> >>>>>
> >>>>> Hope you had a great time on EOSS 2023 :-)
> >>>>
> >>>> Thanks and sorry for the late answer.
> >>>>
> >>>>> Quick recap and additional info on the current issue:
> >>>>>
> >>>>> 1.
> >>>>> The spider-soc QEMU with the additional GICv3 and Timers was tested
> >> with
> >>>> a bare-metal code and proved to be OK.
> >>>>> This bare-metal code sets the A53 timers and GICv3 to handle interrupts
> >> on
> >>>> various execution levels as well as various security levels:
> >>>>> EL1_NS_PHYSICAL_TIMER set as GROUP1_NON_SECURE
> >>>>> EL1_SCR_PHYSICAL_TIMER set as GROUP1_SECURE
> >>>>> EL2_PHYSICAL_TIMER set as GROUP1_SECURE
> >>>>> VIRTUAL_TIMER set as GROUP1_NON_SECURE
> >>>>
> >>>> ok.
> >>>>
> >>>>> 2.
> >>>>> The kernel we build with Buildroot runs OK on virt QEMU but gets stuck
> in
> >>>> the middle when we use our spider-soc QEMU.
> >>>>> There are few differences between those runs:
> >>>>> a.
> >>>>> The virt QEMU is executed with -kernel switch and hence the QEMU
> itself
> >>>> implements the "bootloader" and prepares the DT given to the Kernel.
> >>>>> When the Kernel starts on this platforms it starts at EL1.
> >>>>
> >>>> This can be influenced e.g. on Virt with -M virt,virtualization=on, I think.
> >>>>
> >>>>> b.
> >>>>> The spider-soc QEMU is executed with -device loader,file=spider-soc-
> >> bl1.elf
> >>>>> Just for easy execution and testing, this executable includes all the
> needed
> >>>> binaries (as const data blobs) and it copies the binaries into correct
> >> locations
> >>>> before jumping to Barebox execution.
> >>>>> The list of binaries includes the barebox, kernel, dt, and rootfs.
> >>>>> As you recall, BL31 is compiled via Trusted-Firmware-A and has all it's
> >>>> functions as empty stubs because we currently don't care about CPU
> >> power
> >>>> states.
> >>>>> The prove that BL31 is executed correctly is that Barebox now runs at
> EL2.
> >>>>
> >>>> Good.
> >>>>
> >>>>> At that point the Linux kernel is starting and as I mentioned gets stuck in
> >> the
> >>>> middle (cpu_do_idle function. more details to follow).
> >>>>>
> >>>>> Debugging the kernel with GDB revealed few differences:
> >>>>> 1. When running with Barebox, the kernel starts at EL2 and at some
> point
> >>>> moves to EL1.
> >>>>> Not sure if that has some impact on the following issue but thought it is
> >>>> worth mentioning.
> >>>>> (We get a "CPU: All CPU(s) started at EL2" trace)
> >>>>
> >>>> I get the same on an i.MX8M as well (multi-core Cortex-A53 SoC).
> >>>>
> >>>>> Another difference that might be related to this execution level is that
> >> timers
> >>>> setting shows that it uses the physical timer (as oppose to virt QEMU run
> >> that
> >>>> uses the virtual timer):
> >>>>> The spider-soc QEMU Timers dump:
> >>>>> CNTFRQ_EL0 = 0x3b9aca0
> >>>>> CNTP_CTL_EL0 = 0x5
> >>>>> CNTV_CTL_EL0 = 0x0
> >>>>> CNTP_TVAL_EL0 = 0xff1f2ad5
> >>>>> CNTP_CVAL_EL0 = 0xac5c3240
> >>>>> CNTV_TVAL_EL0 = 0x52c2d916
> >>>>> CNTV_CVAL_EL0 = 0x0
> >>>>>
> >>>>> The virt QEMU Timers dump:
> >>>>> CNTFRQ_EL0 = 0x3b9aca0
> >>>>> CNTP_CTL_EL0 = 0x0
> >>>>> CNTV_CTL_EL0 = 0x5
> >>>>> CNTP_TVAL_EL0 = 0xb8394fbc
> >>>>> CNTP_CVAL_EL0 = 0x0
> >>>>> CNTV_TVAL_EL0 = 0xffd18e39
> >>>>> CNTV_CVAL_EL0 = 0x479858aa
> >>>>>
> >>>>> 2. When running with Barebox, the kernel fails to correctly set the GICv3
> >>>> registers.
> >>>>> So in other words, there are no timer events and hence the scheduler is
> >> not
> >>>> running.
> >>>>> The code get stuck on cpu_do_idle but we also found that the RCU
> cb_list
> >> is
> >>>> not empty (probably explains why scheduler haven't started (just a
> guess)).
> >>>>> We placed a breakpoint just before calling wait_for_completion (from
> >>>> function rcu_barrier on kernel/rcu/tree.c) and found:
> >>>>> bt
> >>>>> #0  rcu_barrier () at kernel/rcu/tree.c:4064
> >>>>> #1  0xffffffc08059e1b4 in mark_readonly () at init/main.c:1789
> >>>>> #2  kernel_init (unused=<optimized out>) at init/main.c:1838
> >>>>> #3  0xffffffc080015e48 in ret_from_fork () at
> >>>> arch/arm64/kernel/entry.S:853
> >>>>>
> >>>>> At that point rcu_state.barrier_cpu_count.counter is 1 (as oppose to
> virt
> >>>> QEMU where it is 0 at that point)
> >>>>> If we place the breakpoint a bit earlier in this rcu_barrier function (just
> >>>> before the for_each_possible_cpu loop) and run few more steps (to get
> the
> >>>> rdp) we see that rdp->cblist.len is 0x268 (616):
> >>>>> p/x rdp->cblist
> >>>>> $1 = {head = 0xffffffc0808f06d0, tails = {0xffffff802fe55a78,
> >>>> 0xffffff802fe55a78, 0xffffff802fe55a78, 0xffffff80001c22c8}, gp_seq =
> >> {0x0,
> >>>> 0x0, 0x0, 0x0}, len = 0x268, seglen = {0x0, 0x0, 0x0, 0x268}, flags = 0x1}
> >>>>>
> >>>>> When we compare that with virt QEMU we see that the rdp->cblist.len
> is 0
> >>>> there.
> >>>>>
> >>>>> IMHO, this all is a result of the GICv3 settings that were not applied
> >> properly.
> >>>>> As a result there are no timer interrupts.
> >>>>>
> >>>>> Further debugging on the GICv3 settings showed that the code
> (function
> >>>> gic_cpu_init on drivers/irqchip/irq-gic-v3.c) tries to write 0xffffffff to
> >>>> GICR_IGROUPR0 (Configure SGIs/PPIs as non-secure Group-1) but when
> >> we
> >>>> try to read it back we get all zeros.
> >>>>> Dumping GICv3 settings after the call to init_IRQ:
> >>>>> Showing only the differences:
> >>>>>                       Spider-SoC QEMU virt QEMU
> >>>>> GICD_CTLR =           0x00000012              0x00000053
> >>>>> GICD_TYPER =          0x037a0402              0x037a0007
> >>>>> GICR0_IGROUPR0 =      0x00000000              0xffffffff
> >>>>> GICR0_ISENABLER0 =    0x00000000              0x0000007f
> >>>>> GICR0_ICENABLER0 =    0x00000000              0x0000007f
> >>>>> GICR0_ICFGR0 =        0x00000000              0xaaaaaaaa
> >>>>>
> >>>>> Any thoughts?
> >>>>> As always, your support is much appreciated!
> >>>>
> >>>> Sorry to disappoint, but I have no hands-on experience with the GIC.
> >>>> My guess would be that you are missing initialization in the TF-A...
> >>>>
> >>>> Cheers,
> >>>> Ahmad
> >>>>
> >>>>>
> >>>>> Cheers,
> >>>>> Lior.
> >>>>>
> >>>>>
> >>>>>> -----Original Message-----
> >>>>>> From: Ahmad Fatoum <a.fatoum@pengutronix.de>
> >>>>>> Sent: Friday, June 30, 2023 8:53 AM
> >>>>>> To: Lior Weintraub <liorw@pliops.com>; Ahmad Fatoum
> >> <ahmad@a3f.at>;
> >>>>>> barebox@lists.infradead.org
> >>>>>> Subject: Re: [PATCH v2] Porting barebox to a new SoC
> >>>>>>
> >>>>>> CAUTION: External Sender
> >>>>>>
> >>>>>> Hi Lior,
> >>>>>>
> >>>>>> On 25.06.23 22:33, Lior Weintraub wrote:
> >>>>>>> Hello Ahmad,
> >>>>>>
> >>>>>> [Sorry for the delay, we're at EOSS 2023 currently]
> >>>>>>
> >>>>>>> I failed to reproduce this issue on virt because the addresses and
> >>>> peripherals
> >>>>>> on virt machine are different and it is difficult to change our code to
> >> match
> >>>>>> that.
> >>>>>>> If you think this is critical I will make extra effort to make it work.
> >>>>>>> AFAIU, this suggestion was made to debug the "conflict" issue.
> >>>>>>
> >>>>>> It's not critical, but I'd have liked to understand this, so I can check
> >>>>>> if it's perhaps a barebox bug.
> >>>>>>
> >>>>>>> Currently the workaround I am using is just to set the size of the
> kernel
> >>>>>> partition to match the exact size of the "Image" file.
> >>>>>>>
> >>>>>>> The other issue I am facing is that Kernel seems stuck on cpu_do_idle
> >> and
> >>>>>> there is no login prompt from the kernel.
> >>>>>>
> >>>>>> Does it call into PSCI during idle?
> >>>>>>
> >>>>>>> As you recall, I am running on a custom QEMU that tries to emulate
> our
> >>>>>> platform.
> >>>>>>> I suspect that I did something wrong with the GICv3 and Timers
> >>>> connectivity.
> >>>>>>> The code I used was based on examples I saw on sbsa-ref.c and virt.c.
> >>>>>>> In addition, I declared the GICv3 and timers on our device tree.
> >>>>>>>
> >>>>>>> I running QEMU with "-d int" so I am also getting trace of exceptions
> >> and
> >>>>>> interrupts.
> >>>>>>
> >>>>>> Nice. Didn't know about this option.
> >>>>>>
> >>>>>> [snip]
> >>>>>>
> >>>>>>> Exception return from AArch64 EL3 to AArch64 EL1 PC
> >>>> 0xffffffc00802112c
> >>>>>>> Taking exception 13 [Secure Monitor Call] on CPU 0
> >>>>>>> ...from EL1 to EL3
> >>>>>>> ...with ESR 0x17/0x5e000000
> >>>>>>> ...with ELR 0xffffffc008021640
> >>>>>>> ...to EL3 PC 0x10005400 PSTATE 0x3cd
> >>>>>>> Exception return from AArch64 EL3 to AArch64 EL1 PC
> >>>> 0xffffffc008021640
> >>>>>>
> >>>>>> Looks fine so far? Doesn't look like it's hanging in EL1.
> >>>>>>
> >>>>>> [snip]
> >>>>>>
> >>>>>>> Segment Routing with IPv6
> >>>>>>> In-situ OAM (IOAM) with IPv6
> >>>>>>> sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver
> >>>>>>> NET: Registered PF_PACKET protocol family
> >>>>>>> NET: Registered PF_KEY protocol family
> >>>>>>> NET: Registered PF_VSOCK protocol family
> >>>>>>> registered taskstats version 1
> >>>>>>> clk: Disabling unused clocks
> >>>>>>> Freeing unused kernel memory: 1664K
> >>>>>>
> >>>>>> Not sure. Normally, I'd try again with pd_ignore_unused
> >> clk_ignore_unused
> >>>> in
> >>>>>> the
> >>>>>> kernel arguments, but I think you define no clocks or power domains
> yet
> >> in
> >>>>>> the DT?
> >>>>>>
> >>>>>> You can try again with kernel command line option initcall_debug and
> see
> >>>>>> what the
> >>>>>> initcall is that is getting stuck. If nothing helps, maybe attach a
> hardware
> >>>>>> debugger?
> >>>>>>
> >>>>>> Cheers,
> >>>>>> Ahmad
> >>>>>>
> >>>>>> --
> >>>>>> Pengutronix e.K.                           |                             |
> >>>>>> Steuerwalder Str. 21                       | http://secure-
> >>>>
> web.cisco.com/1RKlXzLFuAdOeswlWvHRCbVHHvoQssFo7iVFqyvv8Yn0sP-
> >>>>
> >>
> MsWtfVRf2HW_4AXhQNuR5kNBuKLHNWkQfzg5qQhZ2AYhdNYqrfmNM7Isb
> >>>>
> >>
> bDhybYe7C21TIR6Du5pxC7TSTbhhg4oBK3J9y2XyMtJNhBKeliNv2I5G4mlnB_
> >>>> 57ph9x9tlPHstmZ8SL22VzM9RxLoj-5LddbVSsB69VGG-
> >>>> O3Hw57EyoSFWKWmjNjOHDmuU1R3SwOX2tkDMmiLPauqbBc-
> >>>> FP9cAFpclCgrOIJu2Jfef0-
> >>>> sVV346BmbxC1SOFAKCI/http%3A%2F%2Fwww.pengutronix.de%2F  |
> >>>>>> 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0
> |
> >>>>>> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-
> 5555
> >> |
> >>>>>
> >>>>
> >>>> --
> >>>> Pengutronix e.K.                           |                             |
> >>>> Steuerwalder Str. 21                       | http://secure-
> >>>>
> web.cisco.com/1RKlXzLFuAdOeswlWvHRCbVHHvoQssFo7iVFqyvv8Yn0sP-
> >>>>
> >>
> MsWtfVRf2HW_4AXhQNuR5kNBuKLHNWkQfzg5qQhZ2AYhdNYqrfmNM7Isb
> >>>>
> >>
> bDhybYe7C21TIR6Du5pxC7TSTbhhg4oBK3J9y2XyMtJNhBKeliNv2I5G4mlnB_
> >>>> 57ph9x9tlPHstmZ8SL22VzM9RxLoj-5LddbVSsB69VGG-
> >>>> O3Hw57EyoSFWKWmjNjOHDmuU1R3SwOX2tkDMmiLPauqbBc-
> >>>> FP9cAFpclCgrOIJu2Jfef0-
> >>>> sVV346BmbxC1SOFAKCI/http%3A%2F%2Fwww.pengutronix.de%2F  |
> >>>> 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
> >>>> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555
> |
> >>>>
> >>>
> >>
> >> --
> >> Pengutronix e.K.                           |                             |
> >> Steuerwalder Str. 21                       | http://secure-
> >>
> web.cisco.com/1O045o8i98buUBxhuX2t0uvDEzdfDsOOkHXvhw2zsg2diNV8f
> >> 8EZlM9mT9OrlFXuemhHKlD1F1skaFD_YT4n5EVauPPAxrSX4Pme-
> >>
> 1mIgrvUKeAVbZgzovldl0j6jKR2UYKcIgVEIcq1Jov13he3WdyUVs3XVXgcZUZM
> >> vdWOLX-
> >>
> voqQDAMDQcE6r2o_g4m7dbPaKNXliQFWT8yA6bGwtu8N2WM9GIADqK2Z_
> >>
> bICwvebcAHRze2ZNScbJ7p3i_8pZj05GbgDCoHNiHHXcOxapGVvFdPXldfl6Al_8
> >>
> XSVqUw5zEYqsyIn6t8meRIBU3_8e_/http%3A%2F%2Fwww.pengutronix.de
> >> %2F  |
> >> 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
> >> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
> >>
> >
> 
> --
> Pengutronix e.K.                           |                             |
> Steuerwalder Str. 21                       | http://secure-
> web.cisco.com/1afoFuFC3rpiLUQlbUrABGUc9nbtrJEQNAxBKml71H86dBKnb
> YKJO3jZccgayiJmX8aQx4TKbf_sgV4fViIXIr3lxe2jeWKr3cK7EIwIb2eHDv_hMwr
> f0Y3BW5NZTHxftUPSJGz5HN7kuASMWPuKjQrSe_qGFrhV_5nNC_2Nnp2CPK
> amM9K1N-
> YvvKcQq002UT10rL5x1wKosDOZjKM_N28w2ocRP5UpRV2339nJtan1G7k1n
> QWlfFFAgVp-
> asmqiZnMU0_E1rSBPIBT7N9fCtg5A7sHGln7Ux1Huxxdpb0ukPOZtiawk0bLLX
> Y5jRf40/http%3A%2F%2Fwww.pengutronix.de%2F  |
> 31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
> Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |
>