Re: WARNING: Unimplemented Standard Service Call:

On Jun 20, 2025, at 16:51, Bjoern A. Zeeb <bzeeb-lists@lists.zabbadoz.net> wrote:

> I am seeing these when booting main on arm64:
> 
> WARNING: Unimplemented Standard Service Call: 0x840000f0 WARNING: Unimplemented Standard Service Call: 0x84000050
> 
> Can anyone elaborate?

Other than the detailed file version, it looks to be from:

https://github.com/ARM-software/arm-trusted-firmware/blob/master/services/std_svc/std_svc_setup.c#L237

Blame shows it was changed from WARN to VERBOSE back on 
021-May-04, older line#: 169 .


For reference (modern):

arm-trusted-firmware/include/services/errata_abi_svc.h :

. . .
#define ARM_EM_VERSION			U(0x840000F0)
. . .

arm-trusted-firmware/include/services/trng_svc.h

. . .
#define ARM_TRNG_VERSION U(0x84000050)
. . .

/*
 * Top-level Standard Service SMC handler. This handler will in turn dispatch
 * calls to PSCI SMC handler
 */
static uintptr_t std_svc_smc_handler(uint32_t smc_fid,
			     u_register_t x1_arg,
			     u_register_t x2_arg,
			     u_register_t x3_arg,
			     u_register_t x4_arg,
			     void *cookie,
			     void *handle,
			     u_register_t flags)
. . .
	switch (smc_fid) {
	case ARM_STD_SVC_CALL_COUNT:
		/*
		 * Return the number of Standard Service Calls. PSCI is the only
		 * standard service implemented; so return number of PSCI calls
		 */
		SMC_RET1(handle, PSCI_NUM_CALLS);

	case ARM_STD_SVC_UID:
		/* Return UID to the caller */
		SMC_UUID_RET(handle, arm_svc_uid);

	case ARM_STD_SVC_VERSION:
		/* Return the version of current implementation */
		SMC_RET2(handle, STD_SVC_VERSION_MAJOR, STD_SVC_VERSION_MINOR);

	default:
		VERBOSE("Unimplemented Standard Service Call: 0x%x \n", smc_fid);
		SMC_RET1(handle, SMC_UNK);
	}
}

===
Mark Millard
marklmi at yahoo.com