[U-Boot-Users] How to change MPU frequency in U-Boot?

[U-Boot-Users] How to change MPU frequency in U-Boot?

[phAntOm yAng]

Dear All:

I changed MPU/XTal/DPLL1 frequency in linux kernel,
and it is valid.

Now, I want to change MPU frequency in U-Boot.
How to do that?

Thanks,
phantom yang

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??????

[U-Boot-Users] How to change MPU frequency in U-Boot?

[Wolfgang Denk]

In message <20060516185540.8E63F7B602@ws5-10.us4.outblaze.com> you wrote:
> 
> Now, I want to change MPU frequency in U-Boot.
> How to do that?

Start reading your hardware documentation.
Then please read http://www.catb.org/%7eesr/faqs/smart-questions.html

Then post again, and  don't  forget  to  mention  whatarchitecture  /
processor / board you are talking about.

Best regards,

Wolfgang Denk

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Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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[U-Boot-Users] How to change MPU frequency in U-Boot?

[phAntOm yAng]

Dear All:

My platform and environment are U-Boot 1.1.3+Linux 2.6.14-omap1 on omap5912osk.

I try to change the value of MPU MHz, xtal MHz, dpll1 MHz.
After reading the source code, I found two informations:

1)In u-boot-1.1.3/board/omap5912osk/platform.S

VAL_ARM_CKCTL:
        .word 0x3000
VAL_DPLL1_CTL:
        .word 0x2830

2)in linux-2.6.14/arch/arm/mach-omap1/clock.h

/*-------------------------------------------------------------------------
 * Omap1 MPU rate table
 *-------------------------------------------------------------------------*/
static struct mpu_rate rate_table[] = {
	/* MPU MHz, xtal MHz, dpll1 MHz, CKCTL, DPLL_CTL
	 * NOTE: Comment order here is different from bits in CKCTL value:
	 * armdiv, dspdiv, dspmmu, tcdiv, perdiv, lcddiv
	 */
#if defined(CONFIG_OMAP_ARM_192MHZ)
	{ 192000000, 19200000, 192000000, 0x050f, 0x2510 }, /* 1/1/2/2/8/8 */
	{ 192000000, 12000000, 192000000, 0x050f, 0x2810 }, /* 1/1/2/2/8/8 */
	{  96000000, 12000000, 192000000, 0x055f, 0x2810 }, /* 2/2/2/2/8/8 */
	{  48000000, 12000000, 192000000, 0x0baf, 0x2810 }, /* 4/4/4/8/8/8 */
	{  24000000, 12000000, 192000000, 0x0fff, 0x2810 }, /* 8/8/8/8/8/8 */
#endif
#if defined(CONFIG_OMAP_ARM_168MHZ)
	{ 168000000, 12000000, 168000000, 0x010f, 0x2710 }, /* 1/1/1/2/8/8 */
#endif
#if defined(CONFIG_OMAP_ARM_120MHZ)
	{ 120000000, 12000000, 120000000, 0x010a, 0x2510 }, /* 1/1/1/2/4/4 */
#endif
#if defined(CONFIG_OMAP_ARM_60MHZ)
	{  60000000, 12000000,  60000000, 0x0005, 0x2290 }, /* 1/1/1/1/2/2 */
#endif
#if defined(CONFIG_OMAP_ARM_30MHZ)
	{  30000000, 12000000,  60000000, 0x0555, 0x2290 }, /* 2/2/2/2/2/2 */
#endif
	{ 0, 0, 0, 0, 0 },
};

But I can't find a relationship between these informations.

And are VAL_ARM_CKCTL and VAL_DPLL1_CTL the key value? 

Thanks,
phantom yang



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??????

[U-Boot-Users] How to change MPU frequency in U-Boot?

[Stefan Roese]

Hi Phantom,

On Monday 05 June 2006 15:06, phAntOm yAng wrote:
> My platform and environment are U-Boot 1.1.3+Linux 2.6.14-omap1 on
> omap5912osk.
>
> I try to change the value of MPU MHz, xtal MHz, dpll1 MHz.
> After reading the source code, I found two informations:
>
> 1)In u-boot-1.1.3/board/omap5912osk/platform.S

Don't start working on such an old version of U-Boot. Please use current 
top-of-git tree version. Especially for the OMAP5912OSK some important 
changes have been incoorporated.

Best regards,
Stefan

[U-Boot-Users] How to change MPU frequency in U-Boot?

[phAntOm yAng]

Dear all:

Now, I'm working on OMAP5912OSK with U-Boot 1.1.4-gb1d71358-dirty.

The message of print_cpuinfo() is:
CPU:   OMAP1611b at 96.0 MHz (DPLL1=96.0 MHz)

But OMAP5912OSK should work on 192MHz.
How to let OMAP5912 work on 192MHz during U-Boot phase?

I found three reference, but these seem like no direct relationship.

1)OMAP5912OSK Board Support Library
~ti\boards\osk5912\lib\osk5912bsl\osk5912.c
/* -------------------------------------------------------------- *
 *  Clocking Parameters after initialization                      *
 *      DPLL freq:  96 MHz                 192 MHz                *
 *      Clock mode: Fully Sync             Scalable Sync          *
 *      ARM freq:   96 MHz                 192 MHz                *
 *      DSP freq:   96 MHz                 192 MHz                *
 *      DSPMMU freq:96 MHz                 192 MHz                *
 *      TC freq:    96 MHz                 96  MHz                *
 *      LCD freq:   24 MHz                 24  MHz                *
 *      PER freq:   24 MHz                 24  MHz                *
 * -------------------------------------------------------------- */

2)Linux kernel 2.6.14 include file
linux/arch/arm/mach-omap1/clock.h

/*---------------------------------------------------------------
 * Omap1 MPU rate table
 *---------------------------------------------------------------*/
static struct mpu_rate rate_table[] = {
/* MPU MHz, xtal MHz, dpll1 MHz, CKCTL, DPLL_CTL
 * NOTE: Comment order here is different from bits in CKCTL value:
 * armdiv, dspdiv, dspmmu, tcdiv, perdiv, lcddiv
 */
#if defined(CONFIG_OMAP_ARM_192MHZ)
{ 192000000, 19200000, 192000000, 0x050f, 0x2510 }, /* 1/1/2/2/8/8 */
{ 192000000, 12000000, 192000000, 0x050f, 0x2810 }, /* 1/1/2/2/8/8 */
{  96000000, 12000000, 192000000, 0x055f, 0x2810 }, /* 2/2/2/2/8/8 */
{  48000000, 12000000, 192000000, 0x0baf, 0x2810 }, /* 4/4/4/8/8/8 */
{  24000000, 12000000, 192000000, 0x0fff, 0x2810 }, /* 8/8/8/8/8/8 */
#endif
#if defined(CONFIG_OMAP_ARM_168MHZ)
{ 168000000, 12000000, 168000000, 0x010f, 0x2710 }, /* 1/1/1/2/8/8 */
#endif
#if defined(CONFIG_OMAP_ARM_120MHZ)
{ 120000000, 12000000, 120000000, 0x010a, 0x2510 }, /* 1/1/1/2/4/4 */
#endif
#if defined(CONFIG_OMAP_ARM_60MHZ)
{  60000000, 12000000,  60000000, 0x0005, 0x2290 }, /* 1/1/1/1/2/2 */
#endif
#if defined(CONFIG_OMAP_ARM_30MHZ)
{  30000000, 12000000,  60000000, 0x0555, 0x2290 }, /* 2/2/2/2/2/2 */
#endif
{ 0, 0, 0, 0, 0 },
};

3)U-Boot DPLL1 setting
u-boot/board/omap5912osk/lowlevel_init.S

VAL_ARM_CKCTL:
        .word 0x2000 /* was: 0x3000, now use CLK_REF for timer input */
VAL_DPLL1_CTL:
        .word 0x2830

Best regards,
phantom yang

> From: "Stefan Roese"
> Don't start working on such an old version of U-Boot. Please use 
> current top-of-git tree version. Especially for the OMAP5912OSK some 
> important changes have been incoorporated.


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??????

[U-Boot-Users] How to change MPU frequency in U-Boot?

[Hiroki Kaminaga]

Hi,

From: "phAntOm yAng" <dalalilala@hellokitty.com>
> 
> Now, I'm working on OMAP5912OSK with U-Boot 1.1.4-gb1d71358-dirty.
> 
> The message of print_cpuinfo() is:
> CPU:   OMAP1611b at 96.0 MHz (DPLL1=96.0 MHz)
> 
> But OMAP5912OSK should work on 192MHz.
> How to let OMAP5912 work on 192MHz during U-Boot phase?

You might want to check this:

http://linux.omap.com/pipermail/linux-omap-open-source/2006-February/006416.html

Hope this helps.

(Hiroki Kaminaga)
--