Hi Jagan, On Tue, Dec 9, 2014 at 2:04 AM, Jagan Teki <jagannadh.t...@gmail.com> wrote: > Hi Bin, > > On 1 November 2014 at 14:23, Bin Meng <bmeng...@gmail.com> wrote: >> Currently if SST flash advertises SST_WP flag in the params table >> the word program command (ADh) with auto address increment will be >> used for the flash write op. However some SPI controllers do not >> support the word program command (like the Intel ICH 7), the byte >> programm command (02h) has to be used. >> >> A new TX operation mode SPI_OPM_TX_BP is introduced for such SPI >> controller to use byte program op for SST flash. > > We have SST_WP which is word program - for specific flash's (not for > controller specific > at-least from params data) > > Which is this SST_BP relies for ? controller or specific flash ? >
SST_BP is flash specific. In current flash params table, I checked every flash datasheet and found that when an SST flash supports WP, it also supports BP. I believe the WP and BP are companion commands. When an SST flash does not support BP/WP, it supports the page program (02h) which uses the same command code as BP. And the page program (02h) is the command selected by U-Boot for SST flashes which do not have SST_WP flag. However some controllers do not support WP, so that we need the SST_BP flag to let U-Boot selects BP for such controllers, which is what my patch tries to fix. [snip] Regards, Bin _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
