Axone pibmem only image compilation

 - use the following command
   make axone img=pibmem

Change-Id: I60e75fc788d541b3c6d0c97bde44bf3e8c0ebb2b
Reviewed-on: http://rchgit01.rchland.ibm.com/gerrit1/70636
Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com>
Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com>
Reviewed-by: Krishna Swaroop Athmaram <krathmar@in.ibm.com>
Reviewed-by: Sachin Gupta <sgupta2m@in.ibm.com>
Reviewed-by: RAJA DAS <rajadas2@in.ibm.com>

src/build/linkerscripts/power_axone/linksbe.cmd

@@ -0,0 +1,103 @@
+/* IBM_PROLOG_BEGIN_TAG                                                   */
+/* This is an automatically generated prolog.                             */
+/*                                                                        */
+/* $Source: src/build/linkerscripts/power_axone/linksbe.cmd $             */
+/*                                                                        */
+/* OpenPOWER sbe Project                                                  */
+/*                                                                        */
+/* Contributors Listed Below - COPYRIGHT 2019                             */
+/*                                                                        */
+/*                                                                        */
+/* Licensed under the Apache License, Version 2.0 (the "License");        */
+/* you may not use this file except in compliance with the License.       */
+/* You may obtain a copy of the License at                                */
+/*                                                                        */
+/*     http://www.apache.org/licenses/LICENSE-2.0                         */
+/*                                                                        */
+/* Unless required by applicable law or agreed to in writing, software    */
+/* distributed under the License is distributed on an "AS IS" BASIS,      */
+/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or        */
+/* implied. See the License for the specific language governing           */
+/* permissions and limitations under the License.                         */
+/*                                                                        */
+/* IBM_PROLOG_END_TAG                                                     */
+// Need to do this so that elf32-powerpc is not modified!
+#undef powerpc
+
+#ifndef INITIAL_STACK_SIZE
+#define INITIAL_STACK_SIZE 256
+#endif
+#include "sbe_link.H"
+
+OUTPUT_FORMAT(elf32-powerpc);
+
+MEMORY
+{
+ pibmem : ORIGIN = SBE_BASE_ORIGIN, LENGTH = SBE_BASE_LENGTH
+}
+
+SECTIONS
+{
+    . = SBE_BASE_ORIGIN;
+
+    .vectors : {. = ALIGN(512); *(.vectors)} > pibmem
+    .fixed . : {. = ALIGN(512); *(.fixed) } > pibmem
+    .text . : {. = ALIGN(512); *(.text)} > pibmem
+
+    ////////////////////////////////
+    // Read-only Data
+    ////////////////////////////////
+
+    . = ALIGN(8);
+    _RODATA_SECTION_BASE = .;
+
+    // SDA2 constant sections .sdata2 and .sbss2 must be adjacent to each
+    // other.  Our SDATA sections are small so we'll use strictly positive
+    // offsets.
+
+    _SDA2_BASE_ = .;
+   .sdata2 . : { *(.sdata2*) } > pibmem
+   .sbss2  . : { *(.sbss2*) } > pibmem
+
+   // Other read-only data.
+
+    . = ALIGN(8);
+    .rodata . : { ctor_start_address = .;
+                  *(.ctors) *(.ctors.*)
+                  ctor_end_address = .;
+                  *(rodata*) *(.got2) } > pibmem
+
+    _RODATA_SECTION_SIZE = . - _RODATA_SECTION_BASE;
+
+    ////////////////////////////////
+    // Read-write Data
+    ////////////////////////////////
+
+    . = ALIGN(8);
+    _DATA_SECTION_BASE = .;
+
+    // SDA sections .sdata and .sbss must be adjacent to each
+    // other.  Our SDATA sections are small so we'll use strictly positive
+    // offsets.
+
+    _SDA_BASE_ = .;
+    .sdata  . : { *(.sdata*)  } > pibmem
+    _sbss_start = .;
+    .sbss   . : { *(.sbss*)   } > pibmem
+    _sbss_end = .;
+
+    // Other read-write data
+    // It's not clear why boot.S is generating empty .glink,.iplt
+
+   .rela   . : { *(.rela*) } > pibmem
+   .rwdata . : { *(.data*) *(.bss*) } > pibmem
+
+    . = ALIGN(8);
+   _PK_INITIAL_STACK_LIMIT = .;
+   . = . + INITIAL_STACK_SIZE;
+   _PK_INITIAL_STACK = . - 1;
+
+    . = ALIGN(8);
+    _sbe_end = . - 0;
+
+}

src/sbefw/core/sbeirq.C

@@ -5,7 +5,7 @@
 /*                                                                        */
 /* OpenPOWER sbe Project                                                  */
 /*                                                                        */
-/* Contributors Listed Below - COPYRIGHT 2015,2018                        */
+/* Contributors Listed Below - COPYRIGHT 2015,2019                        */
 /* [+] International Business Machines Corp.                              */
 /*                                                                        */
 /*                                                                        */
@@ -238,7 +238,7 @@ extern "C" void i2c_reset()
 ///////////////////////////////////////////////////////////////////
 // SBE handler to save off specific registers
 ///////////////////////////////////////////////////////////////////
-registersave_t __g_register_ffdc;
+registersave_t __g_register_ffdc __attribute__((section (".sbss")));
 uint64_t __g_address_for_register_ffdc = (uint32_t)&__g_register_ffdc;
 
 extern "C" void __sbe_register_saveoff()