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