Porting to a new board

Tue Sep 24 13:06:01 EDT 2013

The power is stable.  The garbled message happens whenever too many
strings are printed out.  So I don't think that's anything to do with
my specific setup.  You might be able to reproduce it.  Try this:

md 0xa0000000+2000
<substitute the beginning of your ram range for 0xa0000000>

On Tue, Sep 24, 2013 at 11:33 AM, Jean-Christophe PLAGNIOL-VILLARD
<plagnioj at jcrosoft.com> wrote:
> On 10:00 Tue 24 Sep     , Allen Kennedy Jr. wrote:
>> The dhcp command gives:
>> "warning: No MAC address set. Using random address 62:1C:8B:DF:6D:4D"
>> Then the device console hangs, Ctrl-C does nothing.  Breaking into it
>> via JTAG, I see
>> the PC and LR are off in the weeds and the stack and registers
>> contains nothing of
>> indication as to where it went awry.
>>
>> md 0x1002b000 does show the FEC registers:
>>  md 0x1002b000
>> 1002b000: 00000600 00000000 00000000 00000600                ................
>> 1002b010: 00000000 00000000 00000000 00000000                ................
>> 1002b020: 00000600 f0000000 00000600 00000600                ................
>> 1002b030: 00000600 00000600 00000600 00000600                ................
>> 1002b040: 6f86782d 00000018 00060006 00040006                -x.o............
>> 1002b050: 6f86782d 00000018 000a0006 00080006                -x.o............
>> 1002b060: 00000000 c0000000 fffffffd fffffffd                ................
>> 1002b070: fffffffd fffffffd fffffffd fffffffd                ................
>> 1002b080: 000b0000 05ee0004 19000000 84680868                ............h.h.
>> 1002b090: ffffffff 00000000 10008208 33428006                ..............B3
>> 1002b0a0: 00c40000 ffffffff ffffffff ffffffff                ................
>> 1002b0b0: ffffffff ffffffff ffffffff ffffffff                ................
>> 1002b0c0: 00000000 00000000 00000000 00000000                ................
>> 1002b0d0: 02b20000 91cc3d09 00000000 0180c200                .....=..........
>> 1002b0e0: 00010000 068f6c9e b50d8808 00010020                .....l...... ...
>> 1002b0f0: 00000000 00000000 00000000 00000000                ................
>>
>>
>> iomem output:
>>  iomem
>> 0x00000000 - 0xffffffff (size 0x00000000) iomem
>>   0x10002000 - 0x10002fff (size 0x00001000) imx21-wdt0
>>   0x10003000 - 0x100030ff (size 0x00000100) imx1-gpt0
>>   0x1000a000 - 0x1000afff (size 0x00001000) imx21-uart0
>>   0x10015000 - 0x100150ff (size 0x00000100) imx1-gpio0
>>   0x10015100 - 0x100151ff (size 0x00000100) imx1-gpio1
>>   0x10015200 - 0x100152ff (size 0x00000100) imx1-gpio2
>>   0x10015300 - 0x100153ff (size 0x00000100) imx1-gpio3
>>   0x10015400 - 0x100154ff (size 0x00000100) imx1-gpio4
>>   0x10015500 - 0x100155ff (size 0x00000100) imx1-gpio5
>>   0x10027000 - 0x10027fff (size 0x00001000) imx27-ccm
>>   0x10028000 - 0x10028fff (size 0x00001000) imx_iim
>>   0x1002b000 - 0x1002bfff (size 0x00001000) imx27-fec
>>   0xa0000000 - 0xa7ffffff (size 0x08000000) ram0
>>     0xa7a00000 - 0xa7dfffff (size 0x00400000) malloc space
>>     0xa7e00000 - 0xa7e1afdf (size 0x0001afe0) barebox
>>     0xa7e1afe0 - 0xa7e20aaf (size 0x00005ad0) barebox data
>>     0xa7e20ab0 - 0xa7e24f4b (size 0x0000449c) bss
>>     0xa7ff8000 - 0xa7ffffff (size 0x00008000) stack
>>   0xd8001000 - 0xd8001fff (size 0x00001000) imx27-esdctl
>>
>> This seems valid to me... does anyone see anything missing?
>>
>> As to putting in some debug statements in the FEC driver, I put an
>> enter and exit line in each function.  Startup gave me this:
>> fec_probe enter
>> fec_alloc_receive_packets enter
>> fec_alloc_receive_packets exit
>> fec_init enter
>> fec_init exit
>> mdio_bus: miibus0: probed
>> fec_probe exit 0
>>
>> So that looks good I would think.
>>
>> The DHCP command as follows:
>> dhcp<enter>
>> warning: No MAC address set. Using random address 12:D4:85:77:78:E4
>> fec_set_hwaddr enter
>> fec_set_hwaddr exit
>> fec_open enter
>> fec_miibus_read enter
>> fec_miibus_read exit
>> <... more reads ... >
>> fec_miibus_read enter
>> fec_miibus_read exit
>> fec_miibus_write enter
>> fec_miibus_write exit
>> fec_miibus_read enter
>> fec_miibus_read exit
>> fec_miibus_read enter
>> fec_miibus_read exit
>> fec_miibus_write enter
>> fec_miibus_write exit
>> fec_miibus_read enter
>> fec_miibus_read exit
>> fec_miibus_write enter
>> fec_miibus_write exit
>> fec_rbd_init enter
>> fec_rbd_init exit
>> fec_tbd_init enter
>> fec_tbd_init exit
>> fec_rx_task_enable enter
>> fec_rx_task_enable exit
>> fec_open exit
>> fec_miibus_read enter
>> fec_miibus_read exit
>>
>> this is followed by many more reads, until the output garbles:
>> fec_miibus_read exit
>> fec_miibus_read enter
>> fec_miibus_read exit
>
> are you sure about the power of the board?
>
> because it seems a clock change otherwise
>
> Best Regards,
> J.
>> miiear
>> miiea
>> iibad
>> iibad
>> fibud
>> fibud e
>> febus us_enfeus_exiecs_rntec_s_xitc__retec_m_reit_mireaer_miret
>> mieadr
>> miiea
>> iibad
>> iibad
>> ibud
>> fibud
>> febus euenfecusexiec_s_nteec_s_xitc__reterc__reit
>> _mreaer
>> _mreat
>> mieadr
>> miead
>> iibad
>>
>> and the chip ends up in the weeds.
>>
>> Any thoughts?
>>
>>
>> On Tue, Sep 24, 2013 at 2:39 AM, Sascha Hauer <s.hauer at pengutronix.de> wrote:
>> > On Mon, Sep 23, 2013 at 04:47:19PM -0500, Allen Kennedy Jr. wrote:
>> >> > What's the output of some network command, like for example 'dhcp'?
>> >>
>> >> This hangs the chip.
>> >
>> > This shouldn't happen. No reaction from the board at all? Does ctrl-c
>> > work? You could add some debug messages to the FEC driver to see where
>> > it hangs.
>> >
>> > One situation where a board might hang is when the clock is disabled,
>> > but I don't see how this can happen since it's explicitly enabled in
>> > arch/arm/mach-imx/clk-imx27.c
>> >
>> > What's the output of 'md 0x1002b000'? Does it show the FEC registers
>> > or does it hang the board aswell? The output of 'iomem' might also
>> > help.
>> >
>> > Sascha
>> >
>> > --
>> > Pengutronix e.K.                           |                             |
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>> >
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