AM5708: AM5708 Silicon revision 2.0 and 2.1 differences

software-dl.ti.com/.../How_to_Guides_Linux_Porting_Guide_AM571x_AM570x_Speed_Grades.html

In the above link it is told

"The AM570x series also include a "J"speed grade that is different than the "X"speed grades for the AM572/1X. If one of these devices is being used on the custom board, U-Boot and Linux need to be changed to account for this difference."

We are using AM5708. In that case what is the modification we need to do in hw_data.c. The crystal used is 19.2MHz.

Vigneswaran,

What frequency you need for your AM5708xJ MPU? This MPU can run up to 1000MHz/1GHz. If you need this 1000MHz/1GHz max speed, u-boot is already set it up, no need to change the code.

u-boot/arch/arm/mach-omap2/omap5/hw_data.c

struct dplls dra7xx_dplls = {
.mpu = mpu_dpll_params_1ghz,
.core = core_dpll_params_2128mhz_dra7xx,
.per = per_dpll_params_768mhz_dra7xx,
.abe = abe_dpll_params_sysclk2_361267khz,
.iva = iva_dpll_params_2330mhz_dra7xx,
.usb = usb_dpll_params_1920mhz,
.ddr = ddr_dpll_params_2128mhz,
.gmac = gmac_dpll_params_2000mhz,
};

/* OPP NOM FREQUENCY for OMAP5 ES2.0, and DRA7 ES1.0 */
static const struct dpll_params mpu_dpll_params_1ghz[NUM_SYS_CLKS] = {
{250, 2, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 12 MHz */
{500, 9, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 20 MHz */
{119, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 16.8 MHz */
{625, 11, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 19.2 MHz */
{500, 12, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 26 MHz */
{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 27 MHz */
{625, 23, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1}, /* 38.4 MHz */
};

u-boot/board/ti/am57xx/board.c

void hw_data_init(void)
{
*prcm = &dra7xx_prcm;

*dplls_data = &dra7xx_dplls;
*ctrl = &dra7xx_ctrl;
}


Check also if below e2e thread will be in help:

e2e.ti.com/.../756609

Regards,
Pavel