[U-Boot] [PATCH v2 6/7] mtd: nand: add driver for diskonchip g4 nand flash

[Marek Vasut]

Dear Mike Dunn,

> This patch adds a driver for the diskonchip G4 nand flash device.  It is
> based on the driver from the linux kernel.
> 
> This also includes a separate SPL driver.  A separate SPL driver is used
> because the device operates in a different mode (reliable mode) when
> loading a boot image, and also because the storage format of the boot
> image is different from normal data (pages are stored redundantly).  The
> SPL driver basically mimics how a typical IPL reads data from the device. 
> The special operating mode and storage format are used to compensate for
> the fact that the IPL does not contain the BCH ecc decoding algorithm (due
> to size constraints).  Although the u-boot SPL *could* use ecc, it
> operates like an IPL for the sake of simplicity and uniformity, since the
> IPL and SPL share the task of loading the u-boot image. As a side benefit,
> the SPL driver is very small.
> 
> [port from linux kernel 3.4 commit
> 570469f3bde7f71cc1ece07a18d54a05b6a8775d]

Scott, this really is your turf.

Best regards,
Marek Vasut