[coreboot] Intel PCH: When is the code for SPI flash reading used?

[Marek Behun]

Hello,

is the code for SPI flash reading (from src/drivers/spi/spi_flash.c)
used at all? From what I understood when reading Intel PCH datasheets,
the SPI controller alone reads the whole BIOS. Is this wrong? Does the
SPI controller read only the bootblock (on ThinkPad X230, for example),
and the bootblock then reads the rest?

Thank you.

Marek