Changeset bdcc814 in rtems for cpukit/score/cpu/sparc/cpu_asm.S

Timestamp:

11/23/21 15:32:23 (16 months ago)

Author:

Sebastian Huber <sebastian.huber@…>

Branches:

master

Children:

61d0df45

Parents:

675e879

git-author:

Sebastian Huber <sebastian.huber@…> (11/23/21 15:32:23)

git-committer:

Sebastian Huber <sebastian.huber@…> (11/26/21 09:43:12)

Message:

sparc: Add workaround for GRLIB-TN-0011

Affected components are the GR712RC, UT699, UT699E, UT700, and
LEON3FT-RTAX. Strictly, the workaround is only necessary if the MMU is
enabled. Use FIX_LEON3FT_B2BST to enable the workaround. This is not
100% appropriate, but the best thing we can use to enable the
workaround.

Close #4551.

File:

• cpukit/score/cpu/sparc/cpu_asm.S (modified) (1 diff)

cpukit/score/cpu/sparc/cpu_asm.S

@@ -191 +191 @@
         mov     1, %g1
 
+#if defined(__FIX_LEON3FT_B2BST)
+        /*
+         * This is a workaround for GRLIB-TN-0011 (Technical Note on LEON3/FT
+         * AHB Lock Release During Atomic Operation).  Affected components are
+         * the GR712RC, UT699, UT699E, UT700, and LEON3FT-RTAX.  Strictly, the
+         * workaround is only necessary if the MMU is enabled.  Using the
+         * __FIX_LEON3FT_B2BST is not 100% appropriate, but the best thing we
+         * can use to enable the workaround.  An alignment padding is filled
+         * with nops.
+         */
+.align 16
+#endif
 .Ltry_update_is_executing: