Thanks for your help!
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Found Unknown flash chip "SFDP-capable chip" (4096 kB, SPI) on ch341a_spi.
Probing for AMIC unknown AMIC SPI chip, 0 kB: probe_spi_rdid_generic: id1 0x85, id2 0x6016
Probing for Atmel unknown Atmel SPI chip, 0 kB: probe_spi_rdid_generic: id1 0x85, id2 0x6016
Probing for Eon unknown Eon SPI chip, 0 kB: probe_spi_rdid_generic: id1 0x85, id2 0x6016
Probing for Macronix unknown Macronix SPI chip, 0 kB: probe_spi_rdid_generic: id1 0x85, id2 0x6016
Probing for PMC unknown PMC SPI chip, 0 kB: probe_spi_rdid_generic: id1 0x85, id2 0x6016
Probing for SST unknown SST SPI chip, 0 kB: probe_spi_rdid_generic: id1 0x85, id2 0x6016
Probing for ST unknown ST SPI chip, 0 kB: probe_spi_rdid_generic: id1 0x85, id2 0x6016
Probing for Sanyo unknown Sanyo SPI chip, 0 kB: probe_spi_rdid_generic: id1 0x85, id2 0x6016
Probing for Winbond unknown Winbond (ex Nexcom) SPI chip, 0 kB: probe_spi_rdid_generic: id1 0x85, id2 0x6016
Probing for Generic unknown SPI chip (RDID), 0 kB: probe_spi_rdid_generic: id1 0x85, id2 0x6016
Probing for Generic unknown SPI chip (REMS), 0 kB: probe_spi_rems: id1 0x85, id2 0x15
Found Unknown flash chip "SFDP-capable chip" (4096 kB, SPI).
No operations were specified.