From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marek Vasut Date: Thu, 11 Apr 2013 21:19:37 +0200 Subject: [U-Boot] [PATCH v2 6/7] mtd: nand: add driver for diskonchip g4 nand flash In-Reply-To: <1365641128-15812-7-git-send-email-mikedunn@newsguy.com> References: <1365641128-15812-1-git-send-email-mikedunn@newsguy.com> <1365641128-15812-7-git-send-email-mikedunn@newsguy.com> Message-ID: <201304112119.37446.marex@denx.de> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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