[meta-freescale] Should all T4240 errata be applied to T1040?

[Bob Cochran]

On 09/19/2014 06:04 AM, zhenhua.luo at freescale.com wrote:
> Hi Bob,
>
> Thanks for the great finding.
>
> Defining the CONFIG_FMAN_T4240 for T1 is inaccurate and potentially dangerous for the correct function. The manual explicitly states for TNTSKS that exceeding the max supported values is not permitted, but it doesn't actually state that the reset value is the maximum permissible value.
>
> As for the correct way to define things, we probably need to share integrations across common SoCs per, e.g., Table A-5 in the T1040 DPAA RM to make SW match our docs properly. A configuration "T4240" is likely a bad one anyway if we should name it effectively "FMAN_V3H_384KiB" vs. "FMAN_V3H_512KiB" for B4860 rev 2.  So it is good to change "FMAN_V3L" for T1 to match the documentation and part behavior.
>
> Also the correct way is to stop configuring such things at compile time to avoid separate kernel build for every FMan revision.


Zhenhua,

I believe a similar issue exists with the dts files.

fsl/qoriq-fman3-0.dtsi defines two O/H ports that don't exist on the 
T1040.

After setting CONFIG_FMAN_V3L,  FM_MAX_NUM_OF_OH_PORTS was defined as 4 
in T4240/dpaa_integration_ext.h.  This matches what I see in the T1040 
SoC RM.

However, during boot, I see errors reported on the command line from the 
FM module:

Freescale FM module (Sep 26 2014:14:25:29), FMD API version 21.1.0
cpu1/1: ! MAJOR FM Error [CPU01, 
drivers/net/ethernet/freescale/fman/src/wrapper/lnxwrp_fm_port.c:272 
ReadFmPortDevTreeNode]: Invalid Value;
cpu1/1: of_get_property(/soc at ffe000000/fman at 400000/port at 86000, 
cell-index) failedcpu1/1:

fsl-fman-port: probe of ffe486000.port failed with error -5
cpu1/1: ! MAJOR FM Error [CPU01, 
drivers/net/ethernet/freescale/fman/src/wrapper/lnxwrp_fm_port.c:272 
ReadFmPortDevTreeNode]: Invalid Value;
cpu1/1: of_get_property(/soc at ffe000000/fman at 400000/port at 87000, 
cell-index) failedcpu1/1:

If I remove the extra O/H ports in my dts file, the errors go away.
	
So, if we follow your suggestion, I believe we should add a 
qoriq-fman3l-0.dtsi file that excludes the non-existent O/H ports.

However, I need some feedback because my T1040 DPAA Reference Manual 
Table A-47 states that the number of O/H ports are SoC specific, so 
maybe some V3L devices actually have these extra O/H ports???

And fsl/t1040si-post.dtsi also specifies the extra two O/H ports, but 
that's a straight forward patch.

Finally, who will do these patches for proper V3H/V3L support (me or 
FSL)?  If I do it, I'm just going to work through the issues with the 
T1040 / V3L (I can't address B4860 rev 2 - don't have the specs & don't 
want them).

Thanks,

Bob
















>
>
> Best Regards,
>
> Zhenhua
>
>> -----Original Message-----
>> From: meta-freescale-bounces at yoctoproject.org [mailto:meta-freescale-
>> bounces at yoctoproject.org] On Behalf Of Bob Cochran
>> Sent: Thursday, September 18, 2014 11:44 AM
>> To: meta-freescale at yoctoproject.org
>> Subject: [meta-freescale] Should all T4240 errata be applied to T1040?
>>
>> I find that during initialization of my T1040rdb-64b using the kernel built with
>> meta-fsl-ppc master, the FMBM_CFG2.TNTASKS field (total number of BMI
>> tasks) is being overwritten to 0x7b (the reset value is documented as 0x3b in
>> the T1040 reference manual).
>>
>> I believe this is being overwritten due to sharing the errata definitions with the
>> T4240, but this particular erratum may not apply to the T1040 and may cause
>> undesirable side effects.
>>
>> The T4240 uses DPAA FMAN_v3H, and the T1040 uses DPAA FMAN_v3L.
>>
>>
>> Here is my understanding of how this erratum (A005127) is being applied to the
>> T1040:
>>
>> 1) t1040_64bit_smp_defconfig defines CONFIG_FMAN_T4240
>>
>> 2) By defining CONFIG_FMAN_T4240,
>> drivers/net/ethernet/freescale/fman/ncsw_config.mk adds
>> -I$(FMAN)/inc/integrations/T4240 to EXTRA_CFLAGS.
>>
>> 3) dpaa_integration_ext.h is included throughout the fman source files from
>> drivers/net/ethernet/freescale/fman/inc/integrations/T4240
>>
>> 4) This defines FM_WRONG_RESET_VALUES_ERRATA_FMAN_A005127, but it is
>> my understanding that this erratum does not apply to the T1040.
>>
>> 5) This results in FMBM_CFG2.TNTASKS being overwritten with a value
>> approximately twice its default value, and my concern is that the FMAN_V3L
>> does not have the resources to support this many tasks.
>>
>>
>>
>> In general, I'm also wondering whether the other errata in the integration file is
>> appropriate for the T1040 and whether the FMAN_v3L devices should have
>> their own integration tree.
>>
>>
>>
>>
>>
>> --
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>