[U-Boot] [T-Engine] UBoot configuration for T-Engine/SH7727 MS7727CP02 DevKit

[thaoth <thaoth@cybersoft-vn.com>]

Hi Nobuhiro Iwamatsu,

1. Clock frequency of board.

#define CONFIG_SYS_CLK_FREQ	33333333
#define TMU_CLK_DIVIDER		4	/* 4 (default), 16, 64, 256 or 1024 */
#define CFG_HZ			(CONFIG_SYS_CLK_FREQ / TMU_CLK_DIVIDER)

I don't understand how to set CONFIG_SYS_CLK_FREQ value. From T-Engine
support, they said clock frequency of board is 144MHz.

CPU:       SH7727 144 MHz
Flash ROM: 80000000 - 807FFFFF : 8 MB (64 KB blk x 128)
           80000000 - 8000FFFF : Monitor Area (64 KB)
           80010000 - 8001007F : RomInfo Area (128 B)
SDRAM:     8C000000 - 8DFFFFFF : 32 MB
           8C000000 - 8C001FFF : Monitor & System Area (8 KB)

Could I set CFG_HZ to 144?
#define CFG_HZ 144

2. Cross compiler tool chain : GCC vs T-Engine toolchain
There are two tool chains 
-
http://www.superh-linux.org/archive/bsp/sh7721_se/toolchain_sh3_gcc4.2.tar.gz
support elf32-sh-linux target.
- Tool chain from T-Engine forum support elf32-sh-tkernel
Using both cross compilers, we could turn on LED on debug board by setting
correct value LED_A and LED_B value. 

3. ICE or JTAG debugger and LED debugging.
I don't have these debug tools, and so hard for debugging. T-Engine/SH7727
DevKit has debug board with 8 LEDs. I could turn on/off these LEDs by
setting correct value to 0xA1600000 memory. But  C function turn on/off LED
cannot work. For example

int cpu_init(void)
{
        // Turn off LED 1 to notify cpu_init is called.
	outw(0x00 & 0xFF, 0xa1600000);
	return 0;
}

I don't know why it isn't called?

Would you please give me your ideas? Thank you a lot.
Regards,
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