Hello, I am new to linux (coming from eCos). My backlight driver does not start up because the reset gpio pin is not correct specified. How does gpio work in Linux? I have 2 platforms that use the same backlight driver, under arm, for freescale imx: imx31_3ds and imx27_3ds. I don't think that matters, I just need to understand the linux gpio. The imx31 platform gives the number 88 as gpio number to the backlight driver. That number comes out of 'iomux-mx3.h'. In 'iomux-mx27.h' the GPIO's are specified in an other way, the "hardware" way, specifying bank and port. I think Linux GPIO needs a sort of general gpio number. But how do I calculate that number out of the datasheet? In the imx31 datasheet, I cannot find that number 88 (or the other numbers in 'iomux-mx3.h'). Kind regards, Jürgen -- Jürgen Lambrecht R&D Associate Tel: +32 (0)51 303045 Fax: +32 (0)51 310670 http://www.televic-rail.com Televic Rail NV - Leo Bekaertlaan 1 - 8870 Izegem - Belgium Company number 0825.539.581 - RPR Kortrijk