Hello everyone, recently I'm trying to port U-Boot 2022.01 to my ipq4019 development board, but I can't get the SPI flash working, when I send the command sf probe, it returns this: drivers/core/uclass.c:325-uclass_find_device_by_seq() 0 drivers/core/uclass.c:333-uclass_find_device_by_seq() - 0 'spi@78b5000' drivers/core/uclass.c:336-uclass_find_device_by_seq() - found drivers/spi/spi-uclass.c:282-spi_find_chip_select() spi_qup spi@78b5000: spi_find_chip_select: plat=bfd95318, cs=0 drivers/core/uclass.c:325-uclass_find_device_by_seq() 0 drivers/core/uclass.c:333-uclass_find_device_by_seq() - 0 'spi@78b5000' drivers/core/uclass.c:336-uclass_find_device_by_seq() - found drivers/spi/spi-uclass.c:282-spi_find_chip_select() spi_qup spi@78b5000: spi_find_chip_select: plat=bfd95318, cs=0 drivers/mtd/spi/spi-nor-core.c:1350- spi_nor_read_id() jedec_spi_nor m25p16@0: unrecognized JEDEC id bytes: ff, ff, ff drivers/spi/spi-uclass.c:439- spi_get_bus_and_cs() spi_get_bus_and_cs: Error path, created=0, device 'm25p16@0' Failed to initialize SPI flash at 0:0 (error -2) Which is not correct because the JEDEC id shouldn't be all Fs, I can't figure out whether it's the SPI driver or SPI flash driver is not working, or I just not doing it right. Any suggestions? Thanks.