[U-Boot] arm: mvebu: u-boot does not start on db-88f6820-gp
Stefan Eichenberger
stefan.eichenberger at netmodule.com
Fri Sep 11 17:02:03 CEST 2015
Hi Stefan,
On 09/11/2015 04:24 PM, Stefan Roese wrote:
> Hi Stefan,
>
> On 11.09.2015 15:50, Stefan Eichenberger wrote:
>> On 09/04/2015 06:44 PM, Stefan Roese wrote:
>>
>>>> Unfortunately u-boot now hangs if I try to load an image from the
>>>> SD-Card:
>>>> e.g. if I run the following command u-boot hangs:
>>>> ext4load mmc 0:2 0x2000000 /boot/kernel.bin
>>>>
>>>> I don't see why exactly it crashes, it seems for me that it's
>>>> always at
>>>> a different position.
>>>>
>>>> Here are two backtraces, always at a different positions:
>>>>
>>>> Here u-boot stopped automatically:
>>>> Program received signal SIGTRAP, Trace/breakpoint trap.
>>>> 0x7ff65d84 in ?? ()
>>>> (gdb) backtrace
>>>> #0 0x7ff65d84 in ?? ()
>>>> #1 0x803663d0 in ?? ()
>>>> #2 0x803663d0 in ?? ()
>>>> Backtrace stopped: previous frame identical to this frame (corrupt
>>>> stack?)
>>>>
>>>> And here I've got perhaps some more information?
>>>> Program received signal SIGSTOP, Stopped (signal).
>>>> v7_inval_dcache_level_setway (log2_line_len=<optimized out>,
>>>> way_shift=<optimized out>, num_ways=<optimized out>,
>>>> num_sets=<optimized out>, level=<optimized out>) at
>>>> arch/arm/cpu/armv7/cache_v7.c:62
>>>> 62 for (set = num_sets - 1; set >= 0; set--) {
>>>> (gdb) backtrace
>>>> #0 v7_inval_dcache_level_setway (log2_line_len=<optimized out>,
>>>> way_shift=<optimized out>,
>>>> num_ways=<optimized out>, num_sets=<optimized out>,
>>>> level=<optimized out>) at arch/arm/cpu/armv7/cache_v7.c:62
>>>> #1 v7_maint_dcache_level_setway (operation=<optimized out>,
>>>> level=9) at
>>>> arch/arm/cpu/armv7/cache_v7.c:129
>>>> #2 v7_maint_dcache_all (operation=2146852864) at
>>>> arch/arm/cpu/armv7/cache_v7.c:147
>>>> #3 0xfffffbe2 in ?? ()
>>>> #4 0xfffffbe2 in ?? ()
>>>>
>>>> Could it be that there is something wrong with cache/dram setup?
>>>
>>> Maybe. Hard to tell. Why don't you use "dcache off" before you start
>>> the command. If this works, then we still have a problem with cache
>>> (L1 / L2)...
>>
>> I now did some tests, it seems that the kernel only crashes if I access
>> the SD-Card, I'm able to load the kernel from an USB-Device. I tried to
>> disable the dcache but the problem still remains.
>>
>> Another problem I have is that if I try to start a mainline kernel, it
>> will crash with the following trace, I think it doesn't find the
>> devicetree for some reasons:
>
> Didn't you mention above, that booting Linux does work when booted via
> USB? Is this crash below a caused by accessing the SD-card?
Sorry that was unclear. I can load the Linux kernel from USB into RAM
and jump to the load address but then Linux crashes. The SD-card access
seems totally broken.
>
>> ## Booting kernel from Legacy Image at 02000000 ...
>> Image Name:
>> Image Type: ARM Linux Kernel Image (uncompressed)
>> Data Size: 7258976 Bytes = 6.9 MiB
>> Load Address: 00008000
>> Entry Point: 00008000
>> Verifying Checksum ... OK
>> ## Flattened Device Tree blob at 03000000
>> Booting using the fdt blob at 0x3000000
>> Loading Kernel Image ... OK
>> Loading Device Tree to 7fb49000, end 7fb4ee70 ... OK
>>
>> Starting kernel ...
>>
>> [ 0.000000] Booting Linux on physical CPU 0x0
>> [ 0.000000] Linux version 4.2.0 (eichenberger at gruene) (gcc version
>> 4.6.4 (Marvell GCC release 20150204-c4af733b 645
>> [ 0.000000] CPU: ARMv7 Processor [414fc091] revision 1 (ARMv7),
>> cr=10c5387d
>> [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing
>> instruction cache
>> [ 0.000000] Machine model: Marvell Armada 385 Development Board
>> [ 0.000000] bootconsole [earlycon0] enabled
>> [ 0.000000] Memory policy: Data cache writealloc
>> [ 0.000000] Unable to handle kernel paging request at virtual address
>> 3fb49000
>> [ 0.000000] pgd = c0004000
>> [ 0.000000] [3fb49000] *pgd=00000000
>> [ 0.000000] Internal error: Oops: 5 [#1] SMP ARM
>> [ 0.000000] Modules linked in:
>> [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.2.0 #67
>> [ 0.000000] Hardware name: Marvell Armada 380/385 (Device Tree)
>> [ 0.000000] task: c06bd528 ti: c06b8000 task.ti: c06b8000
>> [ 0.000000] PC is at fdt_check_header+0x0/0x78
>> [ 0.000000] LR is at __unflatten_device_tree+0x1c/0x12c
>> [ 0.000000] pc : [<c04d960c>] lr : [<c039419c>] psr: 200001d3
>> [ 0.000000] sp : c06b9f38 ip : 00000000 fp : ef7fce40
>> [ 0.000000] r10: c071d2f0 r9 : c05c4d7c r8 : 3fb49000
>> [ 0.000000] r7 : c069454c r6 : c06be514 r5 : c0712f68 r4 :
>> c069454c
>> [ 0.000000] r3 : c071d308 r2 : c069454c r1 : c071d2f0 r0 :
>> 3fb49000
>> [ 0.000000] Flags: nzCv IRQs off FIQs off Mode SVC_32 ISA ARM
>> Segment kernel
>> [ 0.000000] Control: 10c5387d Table: 0000404a DAC: 00000015
>> [ 0.000000] Process swapper (pid: 0, stack limit = 0xc06b8220)
>> [ 0.000000] Stack: (0xc06b9f38 to 0xc06ba000)
>> [ 0.000000]
>> 9f20: ffffffff
>> c0700000
>> [ 0.000000] 9f40: ffff1000 0002f7ff 00001000 00000007 c069e348
>> c069454c c0712f68 c06be514
>> [ 0.000000] 9f60: c06c2dc0 c06be514 0000000c c069514c c069e348
>> c0679448 ffffffff 10c5387d
>> [ 0.000000] 9f80: 414fc091 00000000 00000000 c005aa68 c05c38cc
>> c06b9fb4 00000000 00000000
>> [ 0.000000] 9fa0: 00000001 ffffffff c06f4380 00000000 414fc091
>> 00000000 00000000 c067693c
>> [ 0.000000] 9fc0: 00000000 00000000 00000000 00000000 00000000
>> c06a9288 00000000 c06f4614
>> [ 0.000000] 9fe0: c06ba4c0 c06a9284 c06be624 0000406a 00000000
>> 0000807c 00000000 00000000
>> [ 0.000000] [<c04d960c>] (fdt_check_header) from [<c039419c>]
>> (__unflatten_device_tree+0x1c/0x12c)
>> [ 0.000000] [<c039419c>] (__unflatten_device_tree) from [<c069514c>]
>> (unflatten_device_tree+0x1c/0x34)
>> [ 0.000000] [<c069514c>] (unflatten_device_tree) from [<c0679448>]
>> (setup_arch+0x6e8/0x970)
>> [ 0.000000] [<c0679448>] (setup_arch) from [<c067693c>]
>> (start_kernel+0x88/0x3c0)
>> [ 0.000000] [<c067693c>] (start_kernel) from [<0000807c>] (0x807c)
>> [ 0.000000] Code: e3e0300d eafbbec4 e3e0300d eafbbec9 (e5903000)
>> [ 0.000000] ---[ end trace cb88537fdc8fa200 ]---
>> [ 0.000000] Kernel panic - not syncing: Attempted to kill the idle
>> task!
>> [ 0.000000] ---[ end Kernel panic - not syncing: Attempted to kill
>> the idle task!
>>
>> Do you have an idea what I'm doing wrong here? With the SDK U-Boot
>> everything works fine.
>
> Not really. How much RAM is installed on the board? Does booting work
> with "mem=2G"?
2 GB are correct unfortuantely the mem=2G option did not help. It seems
that the Linux kernel searches the devicetree at 0x3fb47020 (0x7fb47020
before MMU enabled?) but there are only zeros. U-Boot seems to load the
Devicetree correctly so I will try to debug Linux. Perhaps it clears
this region for some reasons.
Thanks,
Stefan
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