uses htif in iss setting

env/ehrenberg/link.lds

@@ -131,6 +131,13 @@ SECTIONS
     *(.gnu.linkonce.d.*)
   } >ram AT>flash :ram_init
 
+  .sdata          :
+  {
+    __SDATA_BEGIN__ = .;
+    *(.sdata .sdata.*)
+    *(.gnu.linkonce.s.*)
+  } >ram AT>flash :ram_init
+
   .srodata        :
   {
     *(.srodata.cst16)
@@ -140,13 +147,6 @@ SECTIONS
     *(.srodata .srodata.*)
   } >ram AT>flash :ram_init
 
-  .sdata          :
-  {
-    __SDATA_BEGIN__ = .;
-    *(.sdata .sdata.*)
-    *(.gnu.linkonce.s.*)
-  } >ram AT>flash :ram_init
-
   . = ALIGN(4);
   PROVIDE( _edata = . );
   PROVIDE( edata = . );

env/ehrenberg/platform.h

@@ -43,7 +43,7 @@
 #include "ehrenberg/devices/fki_cluster_info.h"
 
 #define XIP_START_LOC 0xE0040000
-#define RAM_START_LOC 0x80000000
+#define RAM_START_LOC 0xC0000000
 
 // Misc
 

env/ehrenberg/ram.lds

@@ -118,10 +118,18 @@ SECTIONS
 
   .data          :
   {
+    __DATA_BEGIN__ = .;
     *(.data .data.*)
     *(.gnu.linkonce.d.*)
   } >ram AT>rom :ram_init
 
+  .sdata          :
+  {
+    __SDATA_BEGIN__ = .;
+    *(.sdata .sdata.*)
+    *(.gnu.linkonce.s.*)
+  } >ram AT>rom :ram_init
+
   .srodata        :
   {
     PROVIDE( __global_pointer$ = . + 0x800 );
@@ -132,12 +140,6 @@ SECTIONS
     *(.srodata .srodata.*)
   } >ram AT>rom :ram_init
 
-  .sdata          :
-  {
-    *(.sdata .sdata.*)
-    *(.gnu.linkonce.s.*)
-  } >ram AT>rom :ram_init
-
   . = ALIGN(4);
   PROVIDE( _edata = . );
   PROVIDE( edata = . );
@@ -155,6 +157,7 @@ SECTIONS
   } >ram AT>ram :ram
 
   . = ALIGN(8);
+  __BSS_END__ = .;
   PROVIDE( _end = . );
   PROVIDE( end = . );
 
@@ -164,4 +167,7 @@ SECTIONS
     . = __stack_size;
     PROVIDE( _sp = . );
   } >ram AT>ram :ram
+
+  PROVIDE( tohost = 0xfffffff0 );
+  PROVIDE( fromhost = 0xfffffff8 );
 }

env/ehrenberg/rom.lds

@@ -4,8 +4,8 @@ ENTRY( _start )
 
 MEMORY
 {
-  rom (rxai!w) : ORIGIN = 0xF0080000, LENGTH = 4k
-  ram (wxa!ri) : ORIGIN = 0xC0000000, LENGTH = 32k
+  rom (rxai!w) : ORIGIN = 0xF0080000, LENGTH = 2k
+  ram (wxa!ri) : ORIGIN = 0xC0000000, LENGTH = 128k
 }
 
 PHDRS
@@ -118,13 +118,20 @@ SECTIONS
 
   .data          :
   {
+    __DATA_BEGIN__ = .;
     *(.data .data.*)
     *(.gnu.linkonce.d.*)
   } >ram AT>rom :ram_init
 
+  .sdata          :
+  {
+    __SDATA_BEGIN__ = .;
+    *(.sdata .sdata.*)
+    *(.gnu.linkonce.s.*)
+  } >ram AT>rom :ram_init
+
   .srodata        :
   {
-    PROVIDE( __global_pointer$ = . + 0x800 );
     *(.srodata.cst16)
     *(.srodata.cst8)
     *(.srodata.cst4)
@@ -132,12 +139,6 @@ SECTIONS
     *(.srodata .srodata.*)
   } >ram AT>rom :ram_init
 
-  .sdata          :
-  {
-    *(.sdata .sdata.*)
-    *(.gnu.linkonce.s.*)
-  } >ram AT>rom :ram_init
-
   . = ALIGN(4);
   PROVIDE( _edata = . );
   PROVIDE( edata = . );
@@ -155,6 +156,8 @@ SECTIONS
   } >ram AT>ram :ram
 
   . = ALIGN(8);
+  __BSS_END__ = .;
+  __global_pointer$ = MIN(__SDATA_BEGIN__ + 0x800,  MAX(__DATA_BEGIN__ + 0x800, __BSS_END__ - 0x800));
   PROVIDE( _end = . );
   PROVIDE( end = . );
 

libwrap/sys/write.c

@@ -4,6 +4,7 @@
 #include <stdint.h>
 #include <sys/types.h>
 #include <unistd.h>
+#include <stdint.h>
 
 #include "platform.h"
 #include "stub.h"
@@ -12,6 +13,8 @@
 #include "semihosting.h"
 #endif
 
+extern uint32_t tohost;
+
 ssize_t __wrap_write(int fd, const void *ptr, size_t len) {
   const uint8_t *current = (const uint8_t *)ptr;
 #if defined(SEMIHOSTING)
@@ -25,6 +28,14 @@ ssize_t __wrap_write(int fd, const void *ptr, size_t len) {
     return len;
   }
   // return len;
+#elif defined(BOARD_iss)
+  volatile uint64_t payload[4];
+  payload[0]= 64;
+  payload[1]= 0;
+  payload[2]= (uintptr_t)ptr;
+  payload[3]= len;
+  tohost = (uint32_t)payload;
+  return len;
 #endif
   if (isatty(fd)) {
     for (size_t jj = 0; jj < len; jj++) {
@@ -38,7 +49,7 @@ ssize_t __wrap_write(int fd, const void *ptr, size_t len) {
         uart_write(uart, '\r');
       }
 #elif defined(BOARD_iss)
-      *((uint32_t *)0xFFFF0000) = current[jj];
+      // *((uint32_t *)0xFFFF0000) = current[jj];
 #elif defined(BOARD_TGCP)
       // TODO: implement
 #else