supports binary-format, only esp* supported for now

internal/targets/loader.go

@@ -149,6 +149,39 @@ func (l *Loader) mergeConfig(dst, src *Config) {
 	if src.RelocationModel != "" {
 		dst.RelocationModel = src.RelocationModel
 	}
+	if src.BinaryFormat != "" {
+		dst.BinaryFormat = src.BinaryFormat
+	}
+	if src.FlashCommand != "" {
+		dst.FlashCommand = src.FlashCommand
+	}
+	if src.FlashMethod != "" {
+		dst.FlashMethod = src.FlashMethod
+	}
+	if src.Flash1200BpsReset != "" {
+		dst.Flash1200BpsReset = src.Flash1200BpsReset
+	}
+	if src.MSDFirmwareName != "" {
+		dst.MSDFirmwareName = src.MSDFirmwareName
+	}
+	if src.UF2FamilyID != "" {
+		dst.UF2FamilyID = src.UF2FamilyID
+	}
+	if src.RP2040BootPatch {
+		dst.RP2040BootPatch = src.RP2040BootPatch
+	}
+	if src.Emulator != "" {
+		dst.Emulator = src.Emulator
+	}
+	if src.OpenOCDInterface != "" {
+		dst.OpenOCDInterface = src.OpenOCDInterface
+	}
+	if src.OpenOCDTransport != "" {
+		dst.OpenOCDTransport = src.OpenOCDTransport
+	}
+	if src.OpenOCDTarget != "" {
+		dst.OpenOCDTarget = src.OpenOCDTarget
+	}
 
 	// Merge slices (append, don't replace)
 	if len(src.BuildTags) > 0 {
@@ -163,6 +196,12 @@ func (l *Loader) mergeConfig(dst, src *Config) {
 	if len(src.ExtraFiles) > 0 {
 		dst.ExtraFiles = append(dst.ExtraFiles, src.ExtraFiles...)
 	}
+	if len(src.MSDVolumeName) > 0 {
+		dst.MSDVolumeName = append(dst.MSDVolumeName, src.MSDVolumeName...)
+	}
+	if len(src.GDB) > 0 {
+		dst.GDB = append(dst.GDB, src.GDB...)
+	}
 }
 
 // GetTargetsDir returns the targets directory path