Re: barebox-state setup

[Andreas Wilhelm <andreas.wilhelm@emlix.com>]

On 05/08/2017 02:18 PM, Sascha Hauer wrote:
> On Fri, May 05, 2017 at 03:52:22PM +0200, Andreas Wilhelm wrote:
>> On 05/03/2017 02:13 PM, Sascha Hauer wrote:
>>> On Tue, May 02, 2017 at 03:24:10PM +0200, Andreas Wilhelm wrote:
>>>> Hello,
>>>>
>>>> I am using barebox state to exchange data between barebox and linux. From barebox I can access and change the state without any problems. If I try to access the state using the barebox-state util included with dt-utils (v2017.03.0), I get the following error:
>>>>
>>>>> # barebox-state -g myvar
>>>>> of_get_devicepath: no 'label' property found in /soc/aips-bus@02000000/spba-bus@02000000/ecspi@02008000/m25p80@0
>>>>> Cannot find backend path in /state
>>>> This problem does not occur when using version 2016.08.0 of dt-utils. However, in this version I experienced an other problem. Even with backend-storage-type set to "circular" barebox attempted to storte data in "direct" mode:
>>>>
>>>>> WARNING, no stridesize given although we use a direct file
>>>>> write. Starting in degraded mode
>>>>> Failed to initialize desired amount of direct buckets, only 1 of 3
>>>>> succeeded
>>>> Furthermore changing the state from within barebox worked just fine, while changing it using dt-utils from within a booted linux didn't.
>>>>
>>>> The barebox state is stored in NOR-flash and configured in barebox as followed:
>>>>
>>>>> state: state {
>>>>>     magic = <0x27031977>;
>>>>>     compatible = "barebox,state";
>>>>>     backend-type = "raw";
>>>>>     backend = &flash, "partname:barebox-state";
>>> Please use "backend = &barebox_state;" with a partition like this:
>>>
>>> barebox_state: partition@0 {
>>> 	reg = <0x0 0x40000>;
>>> };
>>>
>>>> Within the linux kernel I use the following configuration
>>> Note that barebox will rewrite the state node in the device tree passed
>>> to Linux to make sure that both are consistent. You do not need to add a
>>> state node to the Linux device tree manually. Unfortunately the
>>> rewriting of the device node does not work correctly if you use the
>>> "partname:" binding above in barebox.
>>>
>>> Sascha
>>>
>> Thanks for your fast reply.
>>
>> Removing the state definition from the linux device tree and changing
>> the backend definition stopped barebox and dt-utils from complaining
>> about a bad state backend. However, now I am facing a strange error.
>>
>> I am able to read and change the barebox state from within barebox and
>> changes are reflected when reading from within barebox and linux. When
>> changing the state using dt-utils, the change is persistent between
>> reboots, but cannot be seen from within barebox.
> First of all, what storage device are you using? Is it a real flash or
> some EEPROM or NVRAM?
>
>> Example:
>>
>> // State myvar initialized with A by default
>>
>> state.myvar=B; state -s
>> => Barebox: echo $state.myvar // myvar=B
>> => Linux: barebox-state -g myvar // myvar=B
>>
>> barebox-state -s myvar=C
>> => Barebox: echo $state.myvar // myvar=B
>> => Linux: barebox-state -g myvar // myvar=C
> This looks like a circular/noncircular mixup somewhere. Could you
> hexdump the state partition (using the md command in barebox) to see if
> the data is stored in circular or noncircular format? In circular format
> you should see two copies of the same data directly after each other.
It is stored in messed up circular-format:

00000000: 77 19 03 27 00 00 0c 00 6f c6 d5 7b 01 54 26 49    w..'....o..{.T&I
00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
00000020: 02 2d fa 14 28 00 00 00 77 19 03 27 00 00 0c 00    .-..(...w..'....
00000030: 0a a1 69 c3 9f 54 8c 85 00 00 00 00 00 00 00 00    ..i..T..........
00000040: 01 00 00 00 00 00 00 00 02 2d fa 14 28 00 00 00    .........-..(...
>
> Also the output of barebox-state with -v might contain some useful
> information.
>
> Sascha
>
>

adding DT alias:ethernet0: stem=ethernet id=0 node=/soc/aips-bus@02100000/ethernet@02188000
adding DT alias:can0: stem=can id=0 node=/soc/aips-bus@02000000/flexcan@02090000
adding DT alias:can1: stem=can id=1 node=/soc/aips-bus@02000000/flexcan@02094000
adding DT alias:gpio0: stem=gpio id=0 node=/soc/aips-bus@02000000/gpio@0209c000
adding DT alias:gpio1: stem=gpio id=1 node=/soc/aips-bus@02000000/gpio@020a0000
adding DT alias:gpio2: stem=gpio id=2 node=/soc/aips-bus@02000000/gpio@020a4000
adding DT alias:gpio3: stem=gpio id=3 node=/soc/aips-bus@02000000/gpio@020a8000
adding DT alias:gpio4: stem=gpio id=4 node=/soc/aips-bus@02000000/gpio@020ac000
adding DT alias:gpio5: stem=gpio id=5 node=/soc/aips-bus@02000000/gpio@020b0000
adding DT alias:gpio6: stem=gpio id=6 node=/soc/aips-bus@02000000/gpio@020b4000
adding DT alias:i2c0: stem=i2c id=0 node=/soc/aips-bus@02100000/i2c@021a0000
adding DT alias:i2c1: stem=i2c id=1 node=/soc/aips-bus@02100000/i2c@021a4000
adding DT alias:i2c2: stem=i2c id=2 node=/soc/aips-bus@02100000/i2c@021a8000
adding DT alias:mmc0: stem=mmc id=0 node=/soc/aips-bus@02100000/usdhc@02190000
adding DT alias:mmc1: stem=mmc id=1 node=/soc/aips-bus@02100000/usdhc@02194000
adding DT alias:mmc2: stem=mmc id=2 node=/soc/aips-bus@02100000/usdhc@02198000
adding DT alias:mmc3: stem=mmc id=3 node=/soc/aips-bus@02100000/usdhc@0219c000
adding DT alias:serial0: stem=serial id=0 node=/soc/aips-bus@02000000/spba-bus@02000000/serial@02020000
adding DT alias:serial1: stem=serial id=1 node=/soc/aips-bus@02100000/serial@021e8000
adding DT alias:serial2: stem=serial id=2 node=/soc/aips-bus@02100000/serial@021ec000
adding DT alias:serial3: stem=serial id=3 node=/soc/aips-bus@02100000/serial@021f0000
adding DT alias:serial4: stem=serial id=4 node=/soc/aips-bus@02100000/serial@021f4000
adding DT alias:spi0: stem=spi id=0 node=/soc/aips-bus@02000000/spba-bus@02000000/ecspi@02008000
adding DT alias:spi1: stem=spi id=1 node=/soc/aips-bus@02000000/spba-bus@02000000/ecspi@0200c000
adding DT alias:spi2: stem=spi id=2 node=/soc/aips-bus@02000000/spba-bus@02000000/ecspi@02010000
adding DT alias:spi3: stem=spi id=3 node=/soc/aips-bus@02000000/spba-bus@02000000/ecspi@02014000
adding DT alias:usbphy0: stem=usbphy id=0 node=/soc/aips-bus@02000000/usbphy@020c9000
adding DT alias:usbphy1: stem=usbphy id=1 node=/soc/aips-bus@02000000/usbphy@020ca000
adding DT alias:spi4: stem=spi id=4 node=/soc/aips-bus@02000000/spba-bus@02000000/ecspi@02018000
adding DT alias:ipu0: stem=ipu id=0 node=/soc/ipu@02400000
adding DT alias:rtc1: stem=rtc id=1 node=/soc/aips-bus@02100000/i2c@021a8000/da9062@58/rtc
adding DT alias:rtc2: stem=rtc id=2 node=/soc/aips-bus@02000000/snvs@020cc000/snvs-rtc-lp@34
adding DT alias:rtc0: stem=rtc id=0 node=/soc/aips-bus@02100000/i2c@021a0000/rtc@68
adding DT alias:ipu1: stem=ipu id=1 node=/soc/ipu@02800000
found state node /state:
state {
        magic = <0x27031977>;
        compatible = "barebox,state";
        backend-type = "raw";
        backend = <0x71>;
        backend-storage-type = "circular";
        #address-cells = <0x1>;
        #size-cells = <0x1>;
        myval1 {
                type = "enum32";
                reg = <0x0 0x4>;
                names = "N", "Y";
        };
        myval2 {
                type = "enum32";
                reg = <0x4 0x4>;
                names = "A", "B";
        };
        myval3 {
                type = "enum32";
                reg = <0x8 0x4>;
                names = "D", "T", "B";
        };
};
state: Read state from -1204245760 length 0
state: Read state from -1204245760 length 65536
state: Read state from -1204245760 length 131072
state: New state registered 'state'
state: Read state from PEB 0 global offset 40 length 0
state: Read state from -1204245760 length 40
state: Read state from PEB 1 global offset 40 length 0
state: Read state from -1204245760 length 65576
state: Read state from PEB 2 global offset 40 length 0
state: Read state from -1204245760 length 131112
state: Using bucket 0@0x00000000

Could this be caused by the definition of #address-cells and #size_cells?

Best regards
Andreas

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