diff --git a/src/avrdude.conf.in b/src/avrdude.conf.in
index 56ecc8ab..449eeb0f 100644
--- a/src/avrdude.conf.in
+++ b/src/avrdude.conf.in
@@ -2115,6 +2115,7 @@ programmer
     desc                   = "Atmel AVR XplainedMini in ISP mode";
     type                   = "jtagice3_isp";
     prog_modes             = PM_ISP;
+    extra_features         = HAS_SUFFER;
     connection_type        = usb;
     usbpid                 = 0x2145;
 ;
@@ -2128,6 +2129,7 @@ programmer
     desc                   = "Atmel AVR XplainedMini in debugWIRE mode";
     type                   = "jtagice3_dw";
     prog_modes             = PM_debugWIRE;
+    extra_features         = HAS_SUFFER;
     connection_type        = usb;
     usbpid                 = 0x2145;
 ;
@@ -2141,6 +2143,7 @@ programmer
     desc                   = "Atmel AVR XplainedMini in UPDI mode";
     type                   = "jtagice3_updi";
     prog_modes             = PM_UPDI;
+    extra_features         = HAS_SUFFER;
     connection_type        = usb;
     usbpid                 = 0x2145;
     hvupdi_support         = 1;
diff --git a/src/config_gram.y b/src/config_gram.y
index 257abf61..4a2e1ac3 100644
--- a/src/config_gram.y
+++ b/src/config_gram.y
@@ -93,6 +93,7 @@ static int pin_name;
 %token K_AVR910_DEVCODE
 %token K_EEPROM
 %token K_ERRLED
+%token K_EXTRA_FEATURES
 %token K_FLASH
 %token K_ID
 %token K_IO
@@ -355,6 +356,11 @@ prog_decl :
       current_prog->lineno = cfg_lineno;
       free_token($3);
     }
+  K_EXTRA_FEATURES TKN_EQUAL numexpr
+    {
+      current_prog->extra_features = $3->value.number;
+      free_token($3);
+    } |
 ;
 
 
diff --git a/src/lexer.l b/src/lexer.l
index 88413a72..7a200948 100644
--- a/src/lexer.l
+++ b/src/lexer.l
@@ -140,6 +140,11 @@ PM_(SPM|TPI|ISP|PDI|UPDI|HVSP|HVPP|debugWIRE|JTAG|JTAGmkI|XMEGAJTAG|AVR32JTAG|aW
   return TKN_NUMBER;
 }
 
+HAS_(SUFFER|VTARG_SWITCH|VTARG_ADJ) { /* Constants */
+  yylval = new_constant(yytext);
+  return TKN_NUMBER;
+}
+
 alias            { yylval=NULL; return K_ALIAS; }
 allowfullpagebitstream { yylval=NULL; ccap(); return K_ALLOWFULLPAGEBITSTREAM; }
 avr910_devcode   { yylval=NULL; ccap(); return K_AVR910_DEVCODE; }
@@ -170,6 +175,7 @@ eeprom           { yylval=NULL; return K_EEPROM; }
 eeprom_instr     { yylval=NULL; ccap(); return K_EEPROM_INSTR; }
 enablepageprogramming { yylval=NULL; ccap(); return K_ENABLEPAGEPROGRAMMING; }
 errled           { yylval=NULL; ccap(); return K_ERRLED; }
+extra_features   { yylval=NULL; ccap(); return K_EXTRA_FEATURES; }
 family_id        { yylval=NULL; ccap(); return K_FAMILY_ID; }
 flash            { yylval=NULL; return K_FLASH; }
 flash_instr      { yylval=NULL; ccap(); return K_FLASH_INSTR; }
diff --git a/src/libavrdude.h b/src/libavrdude.h
index b5ba9234..7df2e44a 100644
--- a/src/libavrdude.h
+++ b/src/libavrdude.h
@@ -211,6 +211,10 @@ typedef struct opcode {
 #define HV_UPDI_VARIANT_1      1 /* Dedicated UPDI pin, no HV (megaAVR0/AVR-Dx) */
 #define HV_UPDI_VARIANT_2      2 /* Shared UPDI pin, HV on _RESET (AVR-DD/AVR-Ex) */
 
+#define HAS_SUFFER             1
+#define HAS_VTARG_SWITCH       2
+#define HAS_VTARG_ADJ          4
+
 #define AVR_FAMILYIDLEN 7
 #define AVR_SIBLEN 16
 #define CTL_STACK_SIZE 32
@@ -735,6 +739,7 @@ typedef struct programmer_t {
   LISTID comments;              // Used by developer options -c*/[ASsr...]
   const char *parent_id;        // Used by developer options
   int prog_modes;               // Programming interfaces, see #define PM_...
+  int extra_features;
   struct pindef_t pin[N_PINS];
   conntype_t conntype;
   int baudrate;