There is no documentation about this within the U-Boot source code
but you should be able to find something on the interwebs.
+config THOR_RESET_OFF
+ bool "thor: Disable reset on completion"
+ depends on CMD_THOR_DOWNLOAD
+
config CMD_ZBOOT
bool "zboot - x86 boot command"
help
CONFIG_SYS_PBSIZE=2077
CONFIG_SYS_BOOTM_LEN=0x3c00000
CONFIG_CMD_THOR_DOWNLOAD=y
+CONFIG_THOR_RESET_OFF=y
CONFIG_CMD_MEMTEST=y
CONFIG_CMD_DFU=y
CONFIG_CMD_I2C=y
CONFIG_SYS_PBSIZE=2077
CONFIG_SYS_BOOTM_LEN=0x3c00000
CONFIG_CMD_THOR_DOWNLOAD=y
+CONFIG_THOR_RESET_OFF=y
CONFIG_CMD_MEMTEST=y
CONFIG_CMD_DFU=y
CONFIG_CMD_I2C=y
CONFIG_SYS_PBSIZE=2077
CONFIG_SYS_BOOTM_LEN=0x3c00000
CONFIG_CMD_THOR_DOWNLOAD=y
+CONFIG_THOR_RESET_OFF=y
CONFIG_CMD_MEMTEST=y
CONFIG_CMD_DFU=y
CONFIG_CMD_I2C=y
CONFIG_SYS_BOOTM_LEN=0x3c00000
CONFIG_CMD_IMLS=y
CONFIG_CMD_THOR_DOWNLOAD=y
+CONFIG_THOR_RESET_OFF=y
CONFIG_CMD_GREPENV=y
CONFIG_CMD_MEMTEST=y
CONFIG_SYS_ALT_MEMTEST=y
CONFIG_SYS_BOOTM_LEN=0x6400000
CONFIG_CMD_BOOTMENU=y
CONFIG_CMD_THOR_DOWNLOAD=y
+CONFIG_THOR_RESET_OFF=y
CONFIG_CMD_GREPENV=y
CONFIG_CMD_NVEDIT_EFI=y
CONFIG_CMD_MEMTEST=y
#if defined(CONFIG_CMD_DFU)
#define DFU_DEFAULT_POLL_TIMEOUT 300
-#define CONFIG_THOR_RESET_OFF
#endif
/* Ethernet driver */
#if defined(CONFIG_CMD_DFU)
#define DFU_DEFAULT_POLL_TIMEOUT 300
-#define CONFIG_THOR_RESET_OFF
#define DFU_ALT_INFO_RAM \
"dfu_ram_info=" \
"setenv dfu_alt_info " \
#if defined(CONFIG_ZYNQMP_USB)
#define DFU_DEFAULT_POLL_TIMEOUT 300
-#define CONFIG_THOR_RESET_OFF
# define PARTS_DEFAULT \
"partitions=uuid_disk=${uuid_gpt_disk};" \
#ifdef CONFIG_USB_EHCI_ZYNQ
# define DFU_DEFAULT_POLL_TIMEOUT 300
-# define CONFIG_THOR_RESET_OFF
#endif
/* enable preboot to be loaded before CONFIG_BOOTDELAY */