On Fri, May 31, 2013 at 05:19:02PM +0530, Tushar Behera wrote: > Printing low-level debug messages make an assumption that the specified > UART port has been preconfigured by the bootloader. Incorrectly > specified UART port results in system getting stalled while printing the > message "Uncompressing Linux... done, booting the kernel" > > This UART port number is specified through S3C_LOWLEVEL_UART_PORT. Since > the UART port might different for different board, it is not possible to > specify it correctly for every board that use a common defconfig file. > > Calling this print subroutine only when DEBUG_LL fixes the problem. By > disabling DEBUG_LL in default config file, we would be able to boot > multiple boards with different default UART ports. > > With this current approach, we miss the print "Uncompressing Linux... > done, booting the kernel." when DEBUG_LL is not defined. > > Signed-off-by: Tushar Behera <tushar.behera@xxxxxxxxxx> > --- > arch/arm/mach-exynos/include/mach/uncompress.h | 11 ++++++++--- > arch/arm/plat-samsung/include/plat/uncompress.h | 10 +++++++++- > 2 files changed, 17 insertions(+), 4 deletions(-) > > diff --git a/arch/arm/mach-exynos/include/mach/uncompress.h b/arch/arm/mach-exynos/include/mach/uncompress.h > index 2979995..730f69f 100644 > --- a/arch/arm/mach-exynos/include/mach/uncompress.h > +++ b/arch/arm/mach-exynos/include/mach/uncompress.h > @@ -37,11 +37,16 @@ static void arch_detect_cpu(void) > chip_id >>= 20; > chip_id &= 0xf; > > +#ifdef CONFIG_DEBUG_LL > if (chip_id == 0x5) > - uart_base = (volatile u8 *)EXYNOS5_PA_UART + (S3C_UART_OFFSET * CONFIG_S3C_LOWLEVEL_UART_PORT); > + uart_base = (volatile u8 *)EXYNOS5_PA_UART + > + (S3C_UART_OFFSET * CONFIG_S3C_LOWLEVEL_UART_PORT); > else > - uart_base = (volatile u8 *)EXYNOS4_PA_UART + (S3C_UART_OFFSET * CONFIG_S3C_LOWLEVEL_UART_PORT); > - > + uart_base = (volatile u8 *)EXYNOS4_PA_UART + > + (S3C_UART_OFFSET * CONFIG_S3C_LOWLEVEL_UART_PORT); > +#else > + uart_base = NULL; > +#endif You can do: if (!config_enabled(CONFIG_DEBUG_LL)) return; Since uart_base will be set to 0 by being in BSS anyway. -Olof -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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