xxx wip

minimal-payload/Makefile

@@ -4,13 +4,20 @@ RV_ARCH = rv32imacxw
 
 CC = riscv-none-elf-gcc
 OBJDUMP = riscv-none-elf-objdump
+OBJCOPY = riscv-none-elf-objcopy
 CFLAGS = -ggdb3 -Os -march=$(RV_ARCH) -ffunction-sections -fdata-sections
 LDFLAGS = -ggdb3 -march=$(RV_ARCH) -Wl,--gc-sections --specs=nosys.specs
 
-all: main.elf
+all: main.uf2
 
 main.elf: startup.o main.o
 
+%.uf2: %.bin
+	~/code/uf2/utils/uf2conv.py -f 0xdeadbeef -b 0x08002000 -o $@ $<
+
+%.bin: %.elf
+	$(OBJCOPY) -O binary $< $@
+
 %.elf: linker.lds
 	$(CC) -Xlinker -Map=$(@:.elf=.map) -Wl,--script=linker.lds -nostartfiles -o $@ $(filter-out linker.lds,$+)
 	$(OBJDUMP) -xdsS $@ >$(@:.elf=.dump)

minimal-payload/linker.lds

@@ -7,7 +7,7 @@ MEMORY
 {
     /* CH32V20x_D6 -> 10 KB SRAM */
     /* allow full flash (incl. non-zero-wait) */
-    FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 224K
+    FLASH (rx) : ORIGIN = 0x00002000, LENGTH = (224K - 8K)
     RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 10K
 }