From: Matthieu CASTET Date: Tue, 6 Nov 2012 10:51:44 +0000 (+0100) Subject: mtd: nand: add NAND_BUSWIDTH_AUTO to autodetect bus width X-Git-Tag: v3.8-rc1~47^2~17 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=64b37b2a63eb2f80b65c7185f0013f8ffc637ae3;p=pandora-kernel.git mtd: nand: add NAND_BUSWIDTH_AUTO to autodetect bus width The driver call nand_scan_ident in 8 bit mode, then readid or onfi detection are done (and detect bus width). The driver should update its bus width before calling nand_scan_tail. This work because readid and onfi are read work 8 byte mode. Note that nand_scan_ident send command (NAND_CMD_RESET, NAND_CMD_READID, NAND_CMD_PARAM), address and read data The ONFI specificication is not very clear for x16 device if high byte of address should be driven to 0, but according to [1] it should be ok to not drive it during autodetection. [1] 3.3.2. Target Initialization [...] The Read ID and Read Parameter Page commands only use the lower 8-bits of the data bus. The host shall not issue commands that use a word data width on x16 devices until the host determines the device supports a 16-bit data bus width in the parameter page. Signed-off-by: Matthieu CASTET Signed-off-by: Artem Bityutskiy --- Reading git-diff-tree failed