spl: make args file optional in falcon mode

Falcon mode loads a kernel file and an args file which is the
device-tree. However in the case of kernel file being a FIT that
contains the device-tree within it, loading the args file is not
required.

Therefore, this patch introduces a new SPL_OS_BOOT_ARGS config options
that allows us to enable or disable loading of the args file in falcon
mode.

Signed-off-by: Anshul Dalal <anshuld@ti.com>

common/spl/Kconfig

@@ -803,7 +803,7 @@ config SPL_FS_LOAD_KERNEL_NAME
 
 config SPL_FS_LOAD_ARGS_NAME
 	string "File to load for the OS kernel argument parameters from the filesystem"
-	depends on (SPL_FS_EXT4 || SPL_FS_FAT || SPL_FS_SQUASHFS) && SPL_OS_BOOT
+	depends on (SPL_FS_EXT4 || SPL_FS_FAT || SPL_FS_SQUASHFS) && SPL_OS_BOOT_ARGS
 	default "args"
 	help
 	  Filename to read to load for the OS kernel argument parameters from
@@ -1121,7 +1121,7 @@ config SPL_UBI_LOAD_KERNEL_ID
 
 config SPL_UBI_LOAD_ARGS_ID
 	int "id of kernel args volume"
-	depends on SPL_OS_BOOT
+	depends on SPL_OS_BOOT_ARGS
 	help
 	  The UBI volume id from which to load the device tree
 
@@ -1215,9 +1215,16 @@ config SPL_OS_BOOT_SECURE
 	  to use falcon mode by disabling certain inherently non-securable options
 	  in the SPL boot flow.
 
+config SPL_OS_BOOT_ARGS
+	bool "Allow SPL to load args for kernel in falcon mode"
+	depends on SPL_OS_BOOT || SPL_LOAD_FIT_OPENSBI_OS_BOOT
+	help
+	  This option enables the SPL to load an args file (usually the FDT)
+	  alongside the kernel image in falcon boot mode.
+
 config SPL_PAYLOAD_ARGS_ADDR
 	hex "Address in memory to load 'args' file for Falcon Mode to"
-	depends on SPL_OS_BOOT || SPL_LOAD_FIT_OPENSBI_OS_BOOT
+	depends on SPL_OS_BOOT_ARGS
 	default 0x88000000 if ARCH_OMAP2PLUS
 	default 0x99000000 if ARCH_SC5XX && SC59X_64
 	default 0xA0000000 if ARCH_SC5XX && TARGET_SC594_SOM_EZKIT
@@ -1257,7 +1264,7 @@ config SYS_MMCSD_RAW_MODE_KERNEL_SECTOR
 
 config SYS_MMCSD_RAW_MODE_ARGS_SECTOR
 	hex "Falcon mode: Sector to load 'args' from MMC"
-	depends on SPL_FALCON_BOOT_MMCSD
+	depends on SPL_FALCON_BOOT_MMCSD && SPL_OS_BOOT_ARGS
 	help
 	  When Falcon mode is used with an MMC or SD media, SPL needs to know
 	  where to look for the OS 'args', typically a device tree. The
@@ -1267,7 +1274,7 @@ config SYS_MMCSD_RAW_MODE_ARGS_SECTOR
 
 config SYS_MMCSD_RAW_MODE_ARGS_SECTORS
 	hex "Falcon mode: Number of sectors to load for 'args' from MMC"
-	depends on SPL_FALCON_BOOT_MMCSD && SYS_MMCSD_RAW_MODE_ARGS_SECTOR != 0x0
+	depends on SPL_FALCON_BOOT_MMCSD && SPL_OS_BOOT_ARGS
 
 config SPL_PAYLOAD
 	string "SPL payload"
@@ -1503,14 +1510,14 @@ config SYS_SPI_KERNEL_OFFS
 
 config SYS_SPI_ARGS_OFFS
 	hex "Falcon mode: address of args payload in SPI flash"
-	depends on SPL_SPI_FLASH_SUPPORT && SPL_OS_BOOT
+	depends on SPL_SPI_FLASH_SUPPORT && SPL_OS_BOOT_ARGS
 	help
 	 Address within SPI-Flash from where the args payload (usually the
 	 dtb) is fetched in falcon boot.
 
 config SYS_SPI_ARGS_SIZE
 	hex "Falcon mode: size of args payload in SPI flash"
-	depends on SPL_SPI_FLASH_SUPPORT && SPL_OS_BOOT
+	depends on SPL_SPI_FLASH_SUPPORT && SPL_OS_BOOT_ARGS
 
 config SPL_THERMAL
 	bool "Driver support for thermal devices"

common/spl/spl.c

@@ -692,6 +692,7 @@ void board_init_r(gd_t *dummy1, ulong dummy2)
 	spl_jump_to_image_t jumper = &jump_to_image;
 	struct spl_image_info spl_image;
 	int ret, os;
+	void *fdt;
 
 	debug(">>" PHASE_PROMPT "board_init_r()\n");
 
@@ -793,8 +794,11 @@ void board_init_r(gd_t *dummy1, ulong dummy2)
 		jumper = &spl_invoke_opensbi;
 	} else if (CONFIG_IS_ENABLED(OS_BOOT) && os == IH_OS_LINUX) {
 		debug("Jumping to Linux\n");
-		if (IS_ENABLED(CONFIG_SPL_OS_BOOT))
-			spl_fixup_fdt((void *)SPL_PAYLOAD_ARGS_ADDR);
+		if (CONFIG_IS_ENABLED(OS_BOOT_ARGS))
+			fdt = (void *)SPL_PAYLOAD_ARGS_ADDR;
+		else
+			fdt = spl_image_fdt_addr(&spl_image);
+		spl_fixup_fdt(fdt);
 		spl_board_prepare_for_linux();
 		jumper = &jump_to_image_linux;
 	} else {

common/spl/spl_ext.c

@@ -103,6 +103,7 @@ int spl_load_image_ext_os(struct spl_image_info *spl_image,
 			goto defaults;
 		}
 
+#if IS_ENABLED(CONFIG_SPL_OS_BOOT_ARGS)
 		ext4fs_set_blk_dev(block_dev, &part_info);
 		ext4fs_mount();
 		file = env_get("falcon_args_file");
@@ -123,6 +124,7 @@ int spl_load_image_ext_os(struct spl_image_info *spl_image,
 		} else {
 			puts("spl: falcon_args_file not set in environment, falling back to default\n");
 		}
+#endif
 	} else {
 		puts("spl: falcon_image_file not set in environment, falling back to default\n");
 	}
@@ -135,6 +137,7 @@ defaults:
 	if (err)
 		return err;
 
+#if IS_ENABLED(CONFIG_SPL_OS_BOOT_ARGS)
 	ext4fs_set_blk_dev(block_dev, &part_info);
 	ext4fs_mount();
 	err = ext4fs_open(CONFIG_SPL_FS_LOAD_ARGS_NAME, &filelen);
@@ -147,6 +150,7 @@ defaults:
 		       __func__, CONFIG_SPL_FS_LOAD_ARGS_NAME, err);
 		return -1;
 	}
+#endif
 
 	return 0;
 }

common/spl/spl_fat.c

@@ -127,6 +127,7 @@ int spl_load_image_fat_os(struct spl_image_info *spl_image,
 			goto defaults;
 		}
 
+#if IS_ENABLED(CONFIG_SPL_OS_BOOT_ARGS)
 		file = env_get("falcon_args_file");
 		if (file) {
 			err = file_fat_read(
@@ -139,6 +140,8 @@ int spl_load_image_fat_os(struct spl_image_info *spl_image,
 			return 0;
 		} else
 			puts("spl: falcon_args_file not set in environment, falling back to default\n");
+#endif
+
 	} else
 		puts("spl: falcon_image_file not set in environment, falling back to default\n");
 
@@ -150,6 +153,7 @@ defaults:
 	if (err)
 		return err;
 
+#if IS_ENABLED(CONFIG_SPL_OS_BOOT_ARGS)
 	err = file_fat_read(CONFIG_SPL_FS_LOAD_ARGS_NAME,
 			    (void *)CONFIG_SPL_PAYLOAD_ARGS_ADDR, 0);
 	if (err <= 0) {
@@ -157,6 +161,7 @@ defaults:
 		       __func__, CONFIG_SPL_FS_LOAD_ARGS_NAME, err);
 		return -1;
 	}
+#endif
 
 	return 0;
 }

common/spl/spl_nand.c

@@ -79,7 +79,7 @@ static int spl_nand_load_element(struct spl_image_info *spl_image,
 static int spl_nand_load_image_os(struct spl_image_info *spl_image,
 				  struct spl_boot_device *bootdev)
 {
-	int *src, *dst, err;
+	int err;
 	struct legacy_img_hdr *header = spl_get_load_buffer(0, sizeof(*header));
 
 	/* load linux */
@@ -101,12 +101,14 @@ static int spl_nand_load_image_os(struct spl_image_info *spl_image,
 	if (err)
 		return err;
 
+#if IS_ENABLED(CONFIG_SPL_OS_BOOT_ARGS)
 	/*
 	 * load parameter image load to temp position since nand_spl_load_image
 	 * reads a whole block which is typically larger than
 	 * CONFIG_CMD_SPL_WRITE_SIZE therefore may overwrite following sections
 	 * like BSS
 	 */
+	int *src, *dst;
 	nand_spl_load_image(CONFIG_CMD_SPL_NAND_OFS, CONFIG_CMD_SPL_WRITE_SIZE,
 			    (void *)CONFIG_TEXT_BASE);
 	/* copy to destintion */
@@ -116,6 +118,7 @@ static int spl_nand_load_image_os(struct spl_image_info *spl_image,
 	     src++, dst++) {
 		writel(readl(src), dst);
 	}
+#endif
 
 	return 0;
 }

common/spl/spl_spi.c

@@ -61,10 +61,15 @@ static int spl_spi_load_image_os(struct spl_image_info *spl_image,
 	if (err)
 		return err;
 
+#if IS_ENABLED(CONFIG_SPL_OS_BOOT_ARGS)
 	/* Read device tree. */
 	return spi_flash_read(flash, CONFIG_SYS_SPI_ARGS_OFFS,
 			      CONFIG_SYS_SPI_ARGS_SIZE,
 			      (void *)CONFIG_SPL_PAYLOAD_ARGS_ADDR);
+#else
+	return 0;
+#endif
+
 }
 #endif
 

common/spl/spl_ubi.c

@@ -22,10 +22,14 @@ int spl_ubi_load_image_os(struct spl_image_info *spl_image,
 
 	volumes[0].vol_id = CONFIG_SPL_UBI_LOAD_KERNEL_ID;
 	volumes[0].load_addr = (void *)CONFIG_SYS_LOAD_ADDR;
+#if IS_ENABLED(CONFIG_SPL_OS_BOOT_ARGS)
 	volumes[1].vol_id = CONFIG_SPL_UBI_LOAD_ARGS_ID;
 	volumes[1].load_addr = (void *)CONFIG_SPL_PAYLOAD_ARGS_ADDR;
 
 	err = ubispl_load_volumes(info, volumes, 2);
+#else
+	err = ubispl_load_volumes(info, volumes, 1);
+#endif
 	if (err)
 		return err;