[PATCH 2/3] bootm: allow disabling uImage support

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

Enabling uImage support unconditionally for bootm is a legacy left-over.
Let's make this configurable via a separate BOOTM_UIMAGE option that can
be disabled for new platforms.

Disabling uImage support saves 4KiB in a LZO compressed ARM64 image.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 commands/Kconfig |  1 -
 common/Kconfig   | 12 ++++++++++--
 common/bootm.c   | 22 +++++++++++++++++-----
 3 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/commands/Kconfig b/commands/Kconfig
index 8d0816c4d0f0..47caae141312 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -427,7 +427,6 @@ config CMD_BOOTM
 	default y
 	depends on BOOTM
 	select CRC32
-	select UIMAGE
 	select UNCOMPRESS
 	select FILETYPE
 	depends on GLOBALVAR
diff --git a/common/Kconfig b/common/Kconfig
index 0000dac8740e..ea7223cffd05 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -564,7 +564,6 @@ config TIMESTAMP
 	  commands like bootm or uimage.
 
 menuconfig BOOTM
-	select UIMAGE
 	default y if COMMAND_SUPPORT
 	bool "bootm support"
 
@@ -608,10 +607,19 @@ config BOOTM_OFTREE
 
 	  -o DTS  specify device tree
 
+config BOOTM_UIMAGE
+	def_bool y
+	prompt "support the legacy uImage format"
+	select UIMAGE
+	depends on BOOTM
+	help
+	  Support using uImages. This format has been superseded
+	  by FIT images and is not as frequently used nowadays.
+
 config BOOTM_OFTREE_UIMAGE
 	bool
 	prompt "support passing device tree (oftree) uImages"
-	depends on BOOTM_OFTREE
+	depends on BOOTM_OFTREE && BOOTM_UIMAGE
 	help
 	  Support using oftree uImages. Without this only raw oftree
 	  blobs can be used.
diff --git a/common/bootm.c b/common/bootm.c
index 4cc88eed76b5..09c93ac4952f 100644
--- a/common/bootm.c
+++ b/common/bootm.c
@@ -92,6 +92,11 @@ static int uimage_part_num(const char *partname)
 	return simple_strtoul(partname, NULL, 0);
 }
 
+static inline bool image_is_uimage(struct image_data *data)
+{
+	return IS_ENABLED(CONFIG_BOOTM_UIMAGE) && data->os;
+}
+
 /*
  * bootm_load_os() - load OS to RAM
  *
@@ -129,7 +134,7 @@ int bootm_load_os(struct image_data *data, unsigned long load_address)
 		return 0;
 	}
 
-	if (data->os) {
+	if (image_is_uimage(data)) {
 		int num;
 
 		num = uimage_part_num(data->os_part);
@@ -175,6 +180,9 @@ static int bootm_open_initrd_uimage(struct image_data *data)
 {
 	int ret;
 
+	if (!IS_ENABLED(CONFIG_BOOTM_UIMAGE))
+		return -ENOSYS;
+
 	if (strcmp(data->os_file, data->initrd_file)) {
 		data->initrd = uimage_open(data->initrd_file);
 		if (!data->initrd)
@@ -482,7 +490,7 @@ int bootm_get_os_size(struct image_data *data)
 
 	if (data->elf)
 		return elf_get_mem_size(data->elf);
-	if (data->os)
+	if (image_is_uimage(data))
 		return uimage_get_size(data->os, uimage_part_num(data->os_part));
 	if (data->os_fit)
 		return data->fit_kernel_size;
@@ -502,6 +510,9 @@ static int bootm_open_os_uimage(struct image_data *data)
 {
 	int ret;
 
+	if (!IS_ENABLED(CONFIG_BOOTM_UIMAGE))
+		return -ENOSYS;
+
 	data->os = uimage_open(data->os_file);
 	if (!data->os)
 		return -EINVAL;
@@ -837,10 +848,11 @@ int bootm_boot(struct bootm_data *bootm_data)
 		release_sdram_region(data->oftree_res);
 	if (data->tee_res)
 		release_sdram_region(data->tee_res);
-	if (data->initrd && data->initrd != data->os)
-		uimage_close(data->initrd);
-	if (data->os)
+	if (image_is_uimage(data)) {
+		if (data->initrd && data->initrd != data->os)
+			uimage_close(data->initrd);
 		uimage_close(data->os);
+	}
 	if (IS_ENABLED(CONFIG_ELF) && data->elf)
 		elf_close(data->elf);
 	if (IS_ENABLED(CONFIG_FITIMAGE) && data->os_fit)
-- 
2.39.2