cleans up bsp read and write for ISS

CMakeLists.txt

@@ -5,8 +5,12 @@ if(NOT DEFINED BOARD)
 message(FATAL_ERROR "No Board selected")
 endif()
 add_compile_definitions("BOARD_${BOARD}")
-# check if we are building for a testbench, adjust the Base accordingly
-set(BOARD_BASE ${BOARD})
+
+set(TESTBENCHES "rtl" "TGCP")
+list(FIND TESTBENCHES ${BOARD} _index)
+if(NOT _index EQUAL -1)
+    set(BOARD "testbench/${BOARD}")
+endif()
 
 option(SEMIHOSTING "Enable semihosting support" OFF)
 if(SEMIHOSTING)
@@ -18,10 +22,10 @@ target_include_directories(startup PUBLIC env include)
 
 add_subdirectory(libwrap)
 
-add_library(bsp STATIC env/${BOARD_BASE}/init.c)
+add_library(bsp STATIC env/${BOARD}/init.c)
 target_link_libraries(bsp PUBLIC startup wrap)
-target_include_directories(bsp PUBLIC env/${BOARD_BASE})
-target_link_options(bsp INTERFACE LINKER:--no-warn-rwx-segments -nostartfiles -T ${CMAKE_CURRENT_SOURCE_DIR}/env/${BOARD_BASE}/link.lds)
+target_include_directories(bsp PUBLIC env/${BOARD})
+target_link_options(bsp INTERFACE LINKER:--no-warn-rwx-segments -nostartfiles -T ${CMAKE_CURRENT_SOURCE_DIR}/env/${BOARD}/link.lds)
 
 if(SEMIHOSTING)
     target_include_directories(bsp INTERFACE include)

env/iss/bsp_read.c

@@ -3,17 +3,4 @@
 #include <sys/types.h>
 #include <unistd.h>
 
-ssize_t _bsp_read(int fd, void *ptr, size_t len) {
-  uint8_t *current = (uint8_t *)ptr;
-  volatile uint32_t *uart_rx = (uint32_t *)0xFFFF0000;
-  ssize_t result = 0;
-  if (isatty(fd)) {
-    for (current = (uint8_t *)ptr; (current < ((uint8_t *)ptr) + len);
-         current++) {
-      *current = *uart_rx;
-      result++;
-    }
-    return result;
-  }
-  return EOF;
-}
+ssize_t _bsp_read(int fd, void *ptr, size_t len) { return EOF; }

env/iss/bsp_write.c

@@ -18,13 +18,6 @@ ssize_t _bsp_write(int fd, const void *ptr, size_t len) {
     payload[2] = (uintptr_t)ptr;
     payload[3] = len;
     tohost = (uintptr_t)payload;
-    /*
-    // accoring to my understading this part is used fot uart wrrite for later
-        for (size_t jj = 0; jj < len; jj++) {
-    *((uint32_t *)0xFFFF0000) = current[jj];
-  }
-    */
-
     return len;
   }