ARM64: zynqmp: Add support for DFU from SPL

SPL needs to have bigger stack size because of USB.
Simple malloc needs to be disabled because dfu code requires different
allocation functions. There is no space in OCM that's why random place
in DDR is used.

BOOTD must be disabled because it is causing compilation error.

All variables are disabled and used only variables valid for DFU because
they are simple huge. Including automatic variables added by
CONFIG_ENV_VARS_UBOOT_CONFIG.
Hardcode addresses for u-boot, atf, kernel and dtb
just for SPL DFU code.

Enable SPL DFU for zcu100.
Create new usb_dfu_spl variable just to run Linux kernel loaded in SPL.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/arm/cpu/armv8/zynqmp/spl.c

@@ -66,6 +66,10 @@ u32 spl_boot_device(void)
 	case SD_MODE:
 	case SD_MODE1:
 		return BOOT_DEVICE_MMC1;
+#endif
+#ifdef CONFIG_SPL_DFU_SUPPORT
+	case USB_MODE:
+		return BOOT_DEVICE_DFU;
 #endif
 	default:
 		printf("Invalid Boot Mode:0x%x\n", bootmode);

board/xilinx/zynqmp/zynqmp.c

@@ -229,6 +229,10 @@ int board_late_init(void)
 
 	puts("Bootmode: ");
 	switch (bootmode) {
+	case USB_MODE:
+		puts("USB_MODE\n");
+		mode = "usb";
+		break;
 	case JTAG_MODE:
 		puts("JTAG_MODE\n");
 		mode = "pxe dhcp";

include/configs/xilinx_zynqmp.h

@@ -75,7 +75,9 @@
 
 /* Diff from config_distro_defaults.h */
 #define CONFIG_SUPPORT_RAW_INITRD
+#if !defined(CONFIG_SPL_BUILD)
 #define CONFIG_ENV_VARS_UBOOT_CONFIG
+#endif
 #define CONFIG_AUTO_COMPLETE
 
 /* PXE */
@@ -136,7 +138,6 @@
 # define DFU_ALT_INFO
 #endif
 
-
 #define CONFIG_BOARD_LATE_INIT
 
 /* Do not preserve environment */
@@ -247,9 +248,20 @@
 	DFU_ALT_INFO
 #endif
 
+/* SPL can't handle all huge variables - define just DFU */
+#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_DFU_SUPPORT)
+#undef CONFIG_EXTRA_ENV_SETTINGS
+# define CONFIG_EXTRA_ENV_SETTINGS \
+	"dfu_alt_info_ram=uboot.bin ram 0x8000000 0x1000000;" \
+			  "atf-uboot.ub ram 0x10000000 0x1000000;" \
+			  "Image ram 0x80000 0x3f80000;" \
+			  "system.dtb ram 0x4000000 0x100000\0" \
+	"dfu_bufsiz=0x1000\0"
+#endif
+
 #define CONFIG_SPL_TEXT_BASE		0xfffc0000
 #define CONFIG_SPL_STACK		0xfffffffc
-#define CONFIG_SPL_MAX_SIZE		0x20000
+#define CONFIG_SPL_MAX_SIZE		0x40000
 
 /* Just random location in OCM */
 #define CONFIG_SPL_BSS_START_ADDR	0x0
@@ -279,4 +291,18 @@
 # define CONFIG_SPL_FS_LOAD_PAYLOAD_NAME	"u-boot.img"
 #endif
 
+#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_DFU_SUPPORT)
+# undef CONFIG_CMD_BOOTD
+# define CONFIG_SPL_ENV_SUPPORT
+# define CONFIG_SPL_HASH_SUPPORT
+# define CONFIG_ENV_MAX_ENTRIES	10
+
+# define CONFIG_SYS_SPL_MALLOC_START	0x20000000
+# define CONFIG_SYS_SPL_MALLOC_SIZE	0x10000000
+
+#ifdef CONFIG_SPL_SYS_MALLOC_SIMPLE
+# error "Disable CONFIG_SPL_SYS_MALLOC_SIMPLE. Full malloc needs to be used"
+#endif
+#endif
+
 #endif /* __XILINX_ZYNQMP_H */