This works perfectly now with dediprog + MX66L51235F!

Before I had the error:

$ flashrom -p dediprog -r test.bios
flashrom v1.1-rc1-12-ga724602-dirty on Linux 4.19.37-2rodete1-amd64 (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Incomplete/failed Command Receive Device String!
Found Macronix flash chip "MX66L51235F" (65536 kB, SPI) on dediprog.
Reading flash... SPI bulk read failed!
SPI bulk read failed!
SPI bulk read failed!
SPI bulk read failed!
SPI bulk read failed!
SPI bulk read failed!
SPI bulk read failed!
SPI bulk read failed!
Read operation failed!
FAILED.

Patch set 3:Code-Review +1

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Gerrit-Project: flashrom
Gerrit-Branch: master
Gerrit-Change-Id: Iab1fd5b2ea550b4b3ef3e8402e0b6ca218485a51
Gerrit-Change-Number: 33613
Gerrit-PatchSet: 3
Gerrit-Owner: Nico Huber <nico.h@gmx.de>
Gerrit-Reviewer: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Gerrit-Reviewer: David Hendricks <david.hendricks@gmail.com>
Gerrit-Reviewer: Nico Huber <nico.h@gmx.de>
Gerrit-Reviewer: Ryan O'Leary
Gerrit-Reviewer: build bot (Jenkins) <no-reply@coreboot.org>
Gerrit-Reviewer: ron minnich <rminnich@chromium.org>
Gerrit-Comment-Date: Thu, 20 Jun 2019 21:38:16 +0000
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