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Date: Wed, 17 Sep 2014 23:43:57 -0400
From: Bob Cochran <yocto@mindchasers.com>
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To: "meta-freescale@yoctoproject.org" <meta-freescale@yoctoproject.org>
Subject: Should all T4240 errata be applied to T1040?
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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.