[flashrom-gerrit] Change in flashrom[master]: Add support for continuous SPI reads

[Edward O'Callaghan (Code Review)]

Hello Alan Green, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/flashrom/+/34584

to look at the new patch set (#2).

Change subject: Add support for continuous SPI reads
......................................................................

Add support for continuous SPI reads

Forward port the original patch from Duncan Laurie 
in commit 06ffd5263892061c5ebf46e52b7878786cf2cece so that it fits for
upstream consumption.

This patch adds support for "unbounded reads" which are for continous
reads to a SPI flash chip instead of reading in page size blocks.

This speeds up the flash process over FTDI by quite a bit, testing
the read of a 16MB part it goes from 2m11s to 0m15s.

Change-Id: I804545aeb1b827ffdd41b21024fd618475e8263a
Signed-off-by: Edward O'Callaghan 
---
M chipdrivers.h
M flash.h
M spi.c
M spi25.c
4 files changed, 32 insertions(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/84/34584/2