gensh1: Simplify bsp_specs

Updates #3250.

c/src/lib/libbsp/sh/gensh1/bsp_specs

@@ -1,13 +1,9 @@
 %rename endfile old_endfile
 %rename startfile old_startfile
-%rename link old_link
 
 *startfile:
 %{!qrtems: %(old_startfile)} \
-%{!nostdlib: %{qrtems: start.o%s crti.o%s crtbegin.o%s -e _start}}
-
-*link:
-%{!qrtems: %(old_link)} %{qrtems: -dc -dp -N}
+%{!nostdlib: %{qrtems: crti.o%s crtbegin.o%s}}
 
 *endfile:
 %{!qrtems: %(old_endfile)} %{qrtems: crtend.o%s crtn.o%s}

c/src/lib/libbsp/sh/gensh1/startup/linkcmds

@@ -28,6 +28,7 @@
 
 OUTPUT_ARCH(sh)
 ENTRY(_start)
+STARTUP(start.o)
 
 _RamBase = DEFINED(_RamBase) ? _RamBase : 0x0a040000;
 _RamSize = DEFINED(_RamSize) ? _RamSize : 512K;