Tony, > -----Original Message----- > From: linux-omap-owner@xxxxxxxxxxxxxxx [mailto:linux-omap-owner@xxxxxxxxxxxxxxx] On Behalf Of Tony > Lindgren > Sent: Wednesday, December 16, 2009 6:24 AM > To: linux-omap@xxxxxxxxxxxxxxx > Subject: Low level debugging using CONFIG_EARLY_PRINTK=y, omap-debug branch removed > > Hi all, > > Recent commit 93fd03a8c6728b58879f8af20ffd55d9c32a778b added > support for CONFIG_EARLY_PRINTK on ARM. Recent earlier kernels > should work too by applying the patch in the commit above. > > This means we can now get rid of the old printk.c hack in the > omap-debug branch, so I've deleted that branch. > > To use the earlyprintk, just do the following: > > 1. Make sure you have the necessary .config options set > > CONFIG_DEBUG_LL=y > CONFIG_EARLY_PRINTK=y > CONFIG_OMAP_LL_DEBUG_UART1=y > # CONFIG_OMAP_LL_DEBUG_UART2 is not set > # CONFIG_OMAP_LL_DEBUG_UART3 is not set > > The LL_DEBUG_UART above is typically 1, but it's 3 on Nokia > boards. > > 2. Edit the kernel CMDLINE in your .config to have "debug earlyprintk" > > Optionally if you have a JTAG console, you can use CONFIG_DEBUG_ICEDCC > instead LL_DEBUG_UART. > > I've also added these instructions to: > > http://www.elinux.org/Debugging_OMAP_kernel I tried this on couple of boards and at least it doesn't work with the options and mentioned bootargs. The low level debug prints are still not coming on console. I haven't debugged it though. Regards, Santosh -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
