fix booting ram, commit to new size

minimal-payload/Makefile

@@ -13,7 +13,7 @@ all: main.uf2
 main.elf: startup.o main.o
 
 %.uf2: %.bin
-	~/code/uf2/utils/uf2conv.py -c -f 0xdeadbeef -b 0x08002000 -o $@ $<
+	~/code/uf2/utils/uf2conv.py -c -f 0xdeadbeef -b 0x08001000 -o $@ $<
 
 %.bin: %.elf
 	$(OBJCOPY) -O binary $< $@
@@ -29,4 +29,4 @@ main.elf: startup.o main.o
 	$(CC) $(CFLAGS) -c -o $@ $<
 
 clean:
-	rm -f *.o *.elf *.map *.dump
+	rm -f *.o *.elf *.map *.dump *.uf2

minimal-payload/linker.lds

@@ -7,7 +7,7 @@ MEMORY
 {
     /* CH32V20x_D6 -> 10 KB SRAM */
     /* allow full flash (incl. non-zero-wait) */
-    FLASH (rx) : ORIGIN = 0x00002000, LENGTH = (224K - 8K)
+    FLASH (rx) : ORIGIN = 0x00001000, LENGTH = (224K - 4K)
     RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 10K
 }