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[v1,0/2] Meson: R/W support for pages used by boot ROM

Message ID 20240402202705.2355326-1-avkrasnov@salutedevices.com
Headers show
Series Meson: R/W support for pages used by boot ROM | expand

Message

Arseniy Krasnov April 2, 2024, 8:27 p.m. UTC 
Amlogic's boot ROM code needs that some pages on NAND must be written
in special "short" ECC mode with scrambling enabled. Such pages:
1) Contain some metadata about hardware.
2) Located with some interval starting from 0 offset, until some
   specified offset. Interval and second offset are set in the
   device tree.

This patchset adds R/W support for such pages. To enable it we can setup
it in dts:

    nand-is-boot-medium;
    meson,boot-page-last = <1024>;
    meson,boot-page-step = <128>;

It means that each 128th page in range 0 to 1024 pages will be accessed
in special mode ("short" ECC + scrambling). In practice this feature is
needed when we want to update first block of NAND - driver will enable
required mode by itself using value from device tree.

Arseniy Krasnov (2):
  dt-bindings: mtd: amlogic,meson-nand: support fields for boot ROM code
  mtd: rawnand: meson: support R/W mode for boot ROM

 .../bindings/mtd/amlogic,meson-nand.yaml      | 16 ++++
 drivers/mtd/nand/raw/meson_nand.c             | 88 +++++++++++++------
 2 files changed, 75 insertions(+), 29 deletions(-)