On 12/09/2013 01:28 AM, Priyanka.Jain@freescale.com wrote:
Hello York,
I am not able to find mail which contains your comment on to undefined CONFIG_DDR_CLK_FREQ, so replying on original mail.
You are right that we don't need to define CONFIG_DDR_CLK_FREQ in case of single source clocking. But as T1040QDS supports both single source clocking and separate clocking (for DDR and sysclk) and we intend to keep single u-boot binary for both modes, we need a mechanism to decide clocking mode at runtime. We thought of implementing it via rcw bit. Please suggest if there is some other good way to do so.
I am thinking this pseudo code
#ifdef CONFIG_SINGLE_SOURCE_CLK if (test) sys_info->freq_ddrbus = CONFIG_SYS_CLK_FREQ; else #endif #ifdef CONFIG_DDR_CLK_FREQ sys_info->freq_ddrbus = CONFIG_DDR_CLK_FREQ; #else sys_info->freq_ddrbus = sysclk; #endif
York