lpcxpresso54114_m4: when i configed system clock from 48M to 96M the target can't work.

[Jeepgoing]

hi,all:

i am testing lpcxpresso54114, i found when i configed system clock from 48M to 96M the target can't work, i have compare arch\arm\soc\nxp_lpc\lpc54xxx\soc.c with the SDK supported by NXP, i found zephyr lost function POWER_SetVoltageForFreq(96000000U);, but i can't find POWER_SetVoltageForFreq source code in SDK, so anyone else have met this issue?

[Jeepgoing]

hello @MaureenHelm ，this issue also appeared in lpc54102, i have attempted to use FLASH API to POWER_SetVoltageForFreq(96000000U), it can work only use optimization -Og, when i use optimization -Os, it‘s can't work.

`/** @defgroup ROMAPI_5410X CHIP: LPC5410X ROM API declarations and functions

• @InGroup CHIP_5410X_DRIVERS
• @{
  */

/**

• @brief High level ROM API structure
  /
  typedef struct {
  const uint32_t reserved_usb; /!< Reserved /
  const uint32_t reserved_clib; /!< Reserved /
  const uint32_t reserved_can; /!< Reserved /
  const uint32_t reserved_pwrd; /!< Reserved /
  const uint32_t reserved_div; /!< Reserved /
  const uint32_t reserved_i2cd; /!< Reserved /
  const uint32_t reserved_dmad; /!< Reserved /
  const uint32_t reserved_spid; /!< Reserved /
  const uint32_t reserved_adcd; /!< Reserved /
  const uint32_t reserved_uartd; /!< Reserved /
  const uint32_t reserved_vfifo; /!< Reserved /
  const uint32_t reserved_usart; /!< Reserved */
  } LPC_ROM_API_T;

/* Pointer to ROM API function address /
#define LPC_ROM_API_BASE_LOC 0x03000200UL
#define LPC_ROM_API ((LPC_ROM_API_T * *) LPC_ROM_API_BASE_LOC)
`

`struct _PWRD {

unsigned int (*set_pll)(unsigned int multiplier, unsigned int input_freq);

unsigned int (*set_voltage)(unsigned int mode, unsigned int desired_freq);

void (*power_mode_configure)(unsigned int mode, unsigned int peripheral);

};`

` struct _PWRD *pPWRD;

pPWRD = (struct _PWRD *)(LPC_ROM_API->reserved_pwrd);

pPWRD->set_voltage(0,CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC);

`

[MaureenHelm]

POWER_SetVoltageForFreq is defined in a library in the MCUXpresso SDK in devices/LPC54114/gcc/libpower_cm4_hardabi.a. There are cm4_softabi and cm0 variants of the library as well. Since these functions are not available in source form, we couldn't import them into Zephyr. This limitation may change after #7516 gets resolved, but for now you can update your project to link in the library from the SDK.

[Jeepgoing]

@MaureenHelm thanks, i have solved this issue according to your advise (link libpower_cm4_softabi.a)