To get pio building, add the generated ld file

ch32v003fun/generated_ch32v003.ld

+ENTRY( InterruptVector )
+MEMORY
+{
+ FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 16K
+ RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 2K
+}
+SECTIONS
+{
+    .init :
+    {
+      _sinit = .;
+      . = ALIGN(4);
+      KEEP(*(SORT_NONE(.init)))
+      . = ALIGN(4);
+      _einit = .;
+    } >FLASH AT>FLASH
+    .text :
+    {
+      . = ALIGN(4);
+      *(.text)
+      *(.text.*)
+      *(.rodata)
+      *(.rodata*)
+      *(.gnu.linkonce.t.*)
+      . = ALIGN(4);
+    } >FLASH AT>FLASH
+    .fini :
+    {
+      KEEP(*(SORT_NONE(.fini)))
+      . = ALIGN(4);
+    } >FLASH AT>FLASH
+    PROVIDE( _etext = . );
+    PROVIDE( _eitcm = . );
+    .preinit_array :
+    {
+      PROVIDE_HIDDEN (__preinit_array_start = .);
+      KEEP (*(.preinit_array))
+      PROVIDE_HIDDEN (__preinit_array_end = .);
+    } >FLASH AT>FLASH
+    .init_array :
+    {
+      PROVIDE_HIDDEN (__init_array_start = .);
+      KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))
+      KEEP (*(.init_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .ctors))
+      PROVIDE_HIDDEN (__init_array_end = .);
+    } >FLASH AT>FLASH
+    .fini_array :
+    {
+      PROVIDE_HIDDEN (__fini_array_start = .);
+      KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))
+      KEEP (*(.fini_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .dtors))
+      PROVIDE_HIDDEN (__fini_array_end = .);
+    } >FLASH AT>FLASH
+    .ctors :
+    {
+      KEEP (*crtbegin.o(.ctors))
+      KEEP (*crtbegin?.o(.ctors))
+      KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))
+      KEEP (*(SORT(.ctors.*)))
+      KEEP (*(.ctors))
+    } >FLASH AT>FLASH
+    .dtors :
+    {
+      KEEP (*crtbegin.o(.dtors))
+      KEEP (*crtbegin?.o(.dtors))
+      KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))
+      KEEP (*(SORT(.dtors.*)))
+      KEEP (*(.dtors))
+    } >FLASH AT>FLASH
+    .dalign :
+    {
+      . = ALIGN(4);
+      PROVIDE(_data_vma = .);
+    } >RAM AT>FLASH
+    .dlalign :
+    {
+      . = ALIGN(4);
+      PROVIDE(_data_lma = .);
+    } >FLASH AT>FLASH
+    .data :
+    {
+      . = ALIGN(4);
+      *(.gnu.linkonce.r.*)
+      *(.data .data.*)
+      *(.gnu.linkonce.d.*)
+      . = ALIGN(8);
+      PROVIDE( __global_pointer$ = . + 0x800 );
+      *(.sdata .sdata.*)
+      *(.sdata2*)
+      *(.gnu.linkonce.s.*)
+      . = ALIGN(8);
+      *(.srodata.cst16)
+      *(.srodata.cst8)
+      *(.srodata.cst4)
+      *(.srodata.cst2)
+      *(.srodata .srodata.*)
+      . = ALIGN(4);
+      PROVIDE( _edata = .);
+    } >RAM AT>FLASH
+    .bss :
+    {
+      . = ALIGN(4);
+      PROVIDE( _sbss = .);
+      *(.sbss*)
+      *(.gnu.linkonce.sb.*)
+      *(.bss*)
+      *(.gnu.linkonce.b.*)
+      *(COMMON*)
+      . = ALIGN(4);
+      PROVIDE( _ebss = .);
+    } >RAM AT>FLASH
+    PROVIDE( _end = _ebss);
+ PROVIDE( end = . );
+ PROVIDE( _eusrstack = ORIGIN(RAM) + LENGTH(RAM));
+}