build: make prepare will remove opensbi firmware directory

This will fix, it you run make sim, then run make prepare
and then run make freeloader, the freeloader is wrong
sdcard uboot can't find mmc device, due to the dtb is bind
to opensbi because make sim, so we need to clean firmware directory
and make a rebuild for firmware

Signed-off-by: Huaqi Fang <[email protected]>

Makefile

@@ -97,9 +97,10 @@ opensbi_srcdir := $(srcdir)/opensbi
 opensbi_wrkdir := $(wrkdir)/opensbi
 opensbi_plat_confdir := $(confdir)/opensbi
 opensbi_plat_srcdir := $(srcdir)/opensbi/platform/generic/nuclei/
-opensbi_payload := $(opensbi_wrkdir)/platform/generic/firmware/fw_payload.elf
-opensbi_jumpbin := $(opensbi_wrkdir)/platform/generic/firmware/fw_jump.bin
-opensbi_jumpelf := $(opensbi_wrkdir)/platform/generic/firmware/fw_jump.elf
+opensbi_firmware_wrkdir := $(opensbi_wrkdir)/platform/generic/firmware
+opensbi_payload := $(opensbi_firmware_wrkdir)/fw_payload.elf
+opensbi_jumpbin := $(opensbi_firmware_wrkdir)/fw_jump.bin
+opensbi_jumpelf := $(opensbi_firmware_wrkdir)/fw_jump.elf
 
 opensbi_plat_deps := $(wildcard $(addprefix $(opensbi_plat_confdir)/, *.mk *.c *.h))
 
@@ -495,7 +496,7 @@ run_openocd:
 	$(openocd) -f $(platform_openocd_cfg)
 
 
-.PHONY: distclean clean cleanboot cleanlinux cleanbuildroot cleansysroot cleanfreeloader  clean_freeloader cleanopensbi prepare presim preboot
+.PHONY: distclean clean cleanboot cleanlinux cleanbuildroot cleansysroot cleanfreeloader clean_freeloader cleanopensbi prepare presim preboot
 distclean:
 	rm -rf $(wrkdir_root)
 
@@ -525,12 +526,11 @@ cleanfreeloader:
 cleanopensbi:
 	rm -rf $(opensbi_wrkdir)
 
-
 # If you change your make target from sim to bootimages, you need to run preboot first
 preboot: prepare
 
 prepare:
-	rm -rf $(vmlinux_bin) $(vmlinux) $(linux_image) $(vmlinux_sim_bin) $(vmlinux_sim)
+	rm -rf $(vmlinux_bin) $(vmlinux) $(linux_image) $(vmlinux_sim_bin) $(vmlinux_sim) $(opensbi_firmware_wrkdir)
 
 .PHONY: sim opensbi_sim presim