On Tue, May 29, 2012 at 11:06:00AM +0200, Roberto Nibali wrote: > Hi Eric > > > > > > http://git.pengutronix.de/?p=barebox.git;a=blob;f=arch/arm/boards/eukrea_cpuimx27/eukrea_cpuimx27.c;h=63e87c9551c440edab572f5252a503ba4d533161;hb=c48de4beee21c3a5573cec084123c33ae08f6f7a > > > > > > > > > > > Now that piece certainly was missing, but how the heck did you find out > > > those register values? Where did you get the information about writing to > > > chip select 0 and selecting: > > > > > > CSCR0U: 0x00008F03 > > > CSCR0L: 0xA0330D01 > > > CSCR0A: 0x002208C0 > > > > > you need the reference manual of the i.MX25 to know the meaning of > > these registers and the datasheet of your flash to know it's timings > > then you can calculate the value to put in the registers. > > > > > I have found them in an old uboot tree a previous person patched to have > working support for NOR on boot. The values are: > > { .ptr_type = 4, .addr = 0xB8002000, .val = 0x0000D003, }, > { .ptr_type = 4, .addr = 0xB8002004, .val = 0x00330D01, }, > { .ptr_type = 4, .addr = 0xB8002008, .val = 0x00220800, }, Do these values match the ones you read out of the registers using your U-Boot? > > /* Set up 16bit NOR flash on WEIM CS0 */ > writel(0xB8002000, 0x0000D003); > writel(0xB8002004, 0x00330D01); > writel(0xB8002008, 0x00220800); You mixed up the argument order. > > board_init_lowlevel_return(); > } > > Why can't I printf() from low_level? Because the console hasn't been setup yet. That's exactly the reason why I recommend doing only the absolutely necessary stuff in lowlevel_init. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
