ls1046a: long time to load/print uboot!

[ASDFGH]

1. env

   ls1046a，customed board，qspi boot，LSDK20.04 ，DDR on board(2G)，none secure boot

2. LSDK20.04 build cmd

   flex-builder -c firmware -m ls1046ardb -b qspi

3. binary-firmware

   bl2_qspi.pbl、fip_uboot.bin        (atf without SPD/BL32，LOG_LEVEL=50)

4. problem

   ①When power on, after BL31 exec, it spend long time（max up to 7 and 8 sec） to print Uboot. 
   ②Sometimes uboot had no print logs, only show BL31 log end.

5. log

   Spoiler

   INFO: RCW BOOT SRC is QSPI
   VERBOSE: Generic delay timer configured with mult=1 and div=25
   INFO: RCW BOOT SRC is QSPI
   VERBOSE: platform clock 700000000
   VERBOSE: DDR PLL1 1600000000
   VERBOSE: DDR PLL2 0
   VERBOSE: Found static setting for rate 1600
   INFO: Time before programming controller 4 ms
   VERBOSE: Program controller registers
   WARNING: Warning: Optimal CPO value not set.
   VERBOSE: total size 2 GB
   VERBOSE: Need to wait up to 640 ms
   VERBOSE: Reading debug[9] as 0x19001900
   VERBOSE: Reading debug[10] as 0x19001900
   VERBOSE: Reading debug[11] as 0x1c001d00
   VERBOSE: Reading debug[12] as 0x1d001d00
   VERBOSE: cpo_min 0x19
   VERBOSE: cpo_max 0x1d
   VERBOSE: debug[28] 0x70006f
   WARNING: Warning: A009942 requires setting cpo_sample to 0x42

   NOTICE: [DBG] dram_size: 2147483648, 2 GB DDR4, 64-bit, CL=11, ECC off
   INFO: Time used by DDR driver 276 ms
   NOTICE: [DBG] dram_regions_info.num_dram_regions = 1
   VERBOSE: Memory seen by this BL image: 0x10000000 - 0x10011000
   VERBOSE: Code region: 0x10000000 - 0x10007000
   VERBOSE: Read-only data region: 0x10007000 - 0x10009000
   VERBOSE: DRAM Region 0: 0x80000000 - 0xfbdfffff
   VERBOSE: Secure DRAM Region 0: 0xfbe00000 - 0xffffffff
   NOTICE: BL2: v1.5(release):LSDK-20.04-dirty
   NOTICE: BL2: Built : 19:59:12, Jan 21 2022
   INFO: Configuring TrustZone Controller
   VERBOSE: TrustZone : Configuring region 0 (TZC Interface Base=0x1500000 sec_attr=0x0, ns_devs=0x0)
   INFO: Value of region base = ffe00000
   VERBOSE: TrustZone : Configuring region (TZC Interface Base: 0x1500000, region_no = 1)...
   VERBOSE: TrustZone : ... base = fbe00000, top = ffdfffff,
   VERBOSE: TrustZone : ... sec_attr = 0x3, ns_devs = 0x0)
   INFO: Value of region base = 1ffe00000
   VERBOSE: TrustZone : Configuring region (TZC Interface Base: 0x1500000, region_no = 2)...
   VERBOSE: TrustZone : ... base = ffe00000, top = ffffffff,
   VERBOSE: TrustZone : ... sec_attr = 0x3, ns_devs = 0xffffffff)
   INFO: Value of region base = fbe00000
   VERBOSE: TrustZone : Configuring region (TZC Interface Base: 0x1500000, region_no = 3)...
   VERBOSE: TrustZone : ... base = 80000000, top = fbdfffff,
   VERBOSE: TrustZone : ... sec_attr = 0x3, ns_devs = 0xffffffff)
   INFO: BL2: Doing platform setup
   INFO: BL2: Loading image id 3
   VERBOSE: FIP header looks OK.
   VERBOSE: Using FIP
   INFO: Loading image id=3 at address 0xfbe00000
   INFO: Image id=3 loaded: 0xfbe00000 - 0xfbe0c631
   INFO: BL2: Loading image id 5
   VERBOSE: FIP header looks OK.
   VERBOSE: Using FIP
   INFO: Loading image id=5 at address 0x82000000
   INFO: Image id=5 loaded: 0x82000000 - 0x820b786c
   NOTICE: BL2: Booting BL31
   INFO: Entry point address = 0xfbe00000
   INFO: SPSR = 0x3cd
   VERBOSE: Argument #0 = 0x1000a3f8
   VERBOSE: Argument #1 = 0x0
   VERBOSE: Argument #2 = 0x0
   VERBOSE: Argument #3 = 0x1000a420
   VERBOSE: Argument #4 = 0x227fffff
   VERBOSE: Argument #5 = 0x0
   VERBOSE: Argument #6 = 0x0
   VERBOSE: Number of DRAM Regions = 1
   VERBOSE: DRAM0 Size = 7be00000
   INFO: SEC is disabled.
   VERBOSE: Memory seen by this BL image: 0xfbe00000 - 0xfbe1b000
   VERBOSE: Code region: 0xfbe00000 - 0xfbe0a000
   VERBOSE: Read-only data region: 0xfbe0a000 - 0xfbe0c000
   VERBOSE: DRAM Region 0: 0x80000000 - 0xfbdfffff
   VERBOSE: Secure DRAM Region 0: 0xfbe00000 - 0xffffffff
   NOTICE: BL31: v1.5(release):LSDK-20.04-dirty
   NOTICE: BL31: Built : 19:59:16, Jan 21 2022
   NOTICE: Welcome to LS1046 BL31 Phase
   INFO: ARM GICv2 driver initialized
   VERBOSE: Leave arm_bl31_platform_setup
   INFO: BL31: Initializing runtime services
   [DBG-mem] uboot start:
   [0x0x82000000]: 0x0a
   [0x0x82000001]: 0x00
   [0x0x82000002]: 0x00
   [0x0x82000003]: 0x14
   [0x0x82000004]: 0x1f
   [0x0x82000005]: 0x20
   [0x0x82000006]: 0x03
   [0x0x82000007]: 0xd5
   [0x0x82000008]: 0x00
   [0x0x82000009]: 0x00
   [DBG-mem] uboot end:
   [0x0x820b7862]: 0x6e
   [0x0x820b7863]: 0x75
   [0x0x820b7864]: 0x6d
   [0x0x820b7865]: 0x2d
   [0x0x820b7866]: 0x6c
   [0x0x820b7867]: 0x61
   [0x0x820b7868]: 0x6e
   [0x0x820b7869]: 0x65
   [0x0x820b786a]: 0x73
   [0x0x820b786b]: 0x00
   INFO: BL31: Preparing for EL3 exit to normal world
   INFO: Entry point address = 0x82000000
   INFO: SPSR = 0x3c9
   VERBOSE: Argument #0 = 0x0
   VERBOSE: Argument #1 = 0x0
   VERBOSE: Argument #2 = 0x0
   VERBOSE: Argument #3 = 0x0
   VERBOSE: Argument #4 = 0x0
   VERBOSE: Argument #5 = 0x0
   VERBOSE: Argument #6 = 0x0
   VERBOSE: Argument #7 = 0x0
   NOTICE: [DBG] el3_exit success

   
   U-Boot 2019.10 (Jan 21 2022 - 17:24:29 -0800)

   SoC: LS1046A Rev1.0 (0x87070110)
   Clock Configuration:
   CPU0(A72):1800 MHz CPU1(A72):1800 MHz CPU2(A72):1800 MHz
   CPU3(A72):1800 MHz
   Bus: 700 MHz DDR: 1600 MT/s FMAN: 800 MHz
   Reset Configuration Word (RCW):
   00000000: 0e100012 10000000 00000000 00000000
   00000010: 11338888 f0000002 40000000 c1000000
   00000020: 00000000 00000000 00000000 0003e879
   00000030: 20104505 00061002 00000096 00000001
   Model: LS1046A RDB Board
   Board: LS1046ARDB, boot from Invalid setting of SW5
   CPLD: V0.0
   PCBA: V0.0
   SERDES Reference Clocks:
   SD1_CLK1 = 100.00MHZ, SD1_CLK2 = 100.00MHZ
   DRAM: VERBOSE: Handling SMC SIP_SVC_MEM_BANK.
   VERBOSE: Handling SMC SIP_SVC_MEM_BANK.
   VERBOSE: Handling SMC SIP_SVC_MEM_BANK.
   1.9 GiB (DDR4, 64-bit, CL=11, ECC off)
   SEC0: RNG instantiated
   Using SERDES1 Protocol: 4403 (0x1133)
   Using SERDES2 Protocol: 34952 (0x8888)
   NAND: 0 MiB
   MMC: FSL_SDHC: 0
   Loading Environment from SPI Flash... unrecognized JEDEC id bytes: c8, 60, 18
   *** Warning - spi_flash_probe_bus_cs() failed, using default environment

   EEPROM: Read failed.
   In: serial
   Out: serial
   Err: serial
   Net: unrecognized JEDEC id bytes: c8, 60, 18
   SF: probe for ucode failed
   Fman1: Data at 00000000f7a38330 is not a firmware
   PCIe0: pcie@3400000 Root Complex: x4 gen2
   PCIe1: pcie@3500000 disabled
   PCIe2: pcie@3600000 disabled
   No ethernet found.
   Hit any key to stop autoboot: 0