#12852 BLOC 13.2.5: DCON DETTL signal integrity

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#12852: DCON DETTL signal integrity
-------------------------------------+-------------------------------------
            Reporter:  Quozl         |          Owner:  Quozl
                Type:  defect        |         Status:  reopened
            Priority:  blocker       |      Milestone:  13.2.5
           Component:  kernel        |        Version:  Development build
          Resolution:                |  as of this date
          Blocked By:                |       Keywords:
Deployments affected:                |       Blocking:
            Verified:  0             |  Action Needed:  design
-------------------------------------+-------------------------------------

Comment (by Quozl):

 XO-4
 * SKU317 works with 0x1830,
 * SKU321 and SKU322 works with 0x1b70,
 * current firmware startup sets register to
 [http://dev.laptop.org/git/users/wmb/cforth/commit/?id=172aa6a39d9b0ace83ebbffaf8ea92264bac1a6c
 0x1b70],
 * current firmware resume after suspend sets register to
 [http://code.coreboot.org/p/openfirmware/source/commit/3758/ 0x1830]; but
 is not used in production tests or booting,
 * prior kernel sets register to [http://dev.laptop.org/git/olpc-
 kernel/commit/?h=arm-3.5&id=04a7936ea42ba2a02566dcd94b45704c85af922a
 0x1b70],
 * current kernel sets register to [http://dev.laptop.org/git/olpc-
 kernel/commit/?h=arm-3.5&id=ee86c533b7303a13c20da9079601055d2024358a
 0x1b70], but only where manufacturing date is 2015 or greater,
 * current kernel on XO-4 SKU317 does not set register, it is inherited
 from firmware,

 Next [http://dev.laptop.org/~quozl/y/1Z0440.txt proposed patch] changes
 last point only, test kernel is in
 [http://dev.laptop.org/~quozl/12852-ee86c53-new-1b70-old-1830.tar.gz
 12852-ee86c53-new-1b70-old-1830.tar.gz]

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Ticket URL: <http://dev.laptop.org/ticket/12852#comment:17>
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