[RTEMS Project] #3057: Add a workaround for the LEON3FT store-store errata

RTEMS trac trac at rtems.org
Mon Jul 17 05:42:47 UTC 2017

#3057: Add a workaround for the LEON3FT store-store errata
 Reporter:  Sebastian Huber  |       Owner:  Daniel Hellstrom
     Type:  defect           |      Status:  assigned
 Priority:  normal           |   Milestone:  4.12.0
Component:  GCC              |     Version:
 Severity:  blocker          |  Resolution:
 Keywords:                   |

Comment (by Daniel Cederman <cederman@…>):

 In [changeset:"2f8704b6c8c3ce65cdf2b589a98de1d1d9dc8ffa/rtems"
 #!CommitTicketReference repository="rtems"
 sparc: Add assembly workaround for LEON3FT B2BST errata

 This patch adds NOP instructions to prevent instruction sequences
 that are sensitive to the LEON3FT B2BST errata. See GRLIB-TN-0009:
 "LEON3FT Stale Cache Entry After Store with Data Tag Parity Error"
 for more information.

 The sequences are only modified if __FIX_LEON3FT_B2BST is defined.

 The patch works in conjunction with the -mfix-ut700, -mfix-gr712rc,
 and -mfix-ut699 GCC flags that prevents the sensitive sequences from
 being generated.

 Update #3057.

Ticket URL: <http://devel.rtems.org/ticket/3057#comment:2>
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