#12852 BLOC 13.2.5: DCON DETTL signal integrity

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Wed Jun 3 04:33:07 EDT 2015

#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):

 * SKU317 works with 0x1830,
 * SKU321 and SKU322 works with 0x1b70,
 * current firmware startup sets register to
 * 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-
 * current kernel sets register to [http://dev.laptop.org/git/olpc-
 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

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