Utilities for decoding DDR4 SPDs. More...

#include <spd.h>
#include <device/dram/common.h>
#include <types.h>

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Data Structures
struct	dimm_attr_ddr4_st
	DIMM characteristics. More...

Macros
#define	SPD_DDR4_PART_OFF 329

#define	SPD_DDR4_PART_LEN 20

Typedefs
typedef u8	spd_raw_data[512]

Enumerations
enum	spd_dimm_type_ddr4 { SPD_DDR4_DIMM_TYPE_EXTENDED = 0x0 , SPD_DDR4_DIMM_TYPE_RDIMM = 0x1 , SPD_DDR4_DIMM_TYPE_UDIMM = 0x2 , SPD_DDR4_DIMM_TYPE_SO_DIMM = 0x3 , SPD_DDR4_DIMM_TYPE_LRDIMM = 0x4 , SPD_DDR4_DIMM_TYPE_MINI_RDIMM = 0x5 , SPD_DDR4_DIMM_TYPE_MINI_UDIMM = 0x6 , SPD_DDR4_DIMM_TYPE_72B_SO_RDIMM = 0x8 , SPD_DDR4_DIMM_TYPE_72B_SO_UDIMM = 0x9 , SPD_DDR4_DIMM_TYPE_16B_SO_DIMM = 0xc , SPD_DDR4_DIMM_TYPE_32B_SO_DIMM = 0xd , SPD_DDR4_DIMM_TYPE_MASK = 0xf }

Functions
int	spd_decode_ddr4 (struct dimm_attr_ddr4_st *dimm, spd_raw_data spd)
	Decode the raw SPD data. More...

enum cb_err	spd_add_smbios17_ddr4 (const u8 channel, const u8 slot, const u16 selected_freq, const struct dimm_attr_ddr4_st *info)

uint16_t	ddr4_speed_mhz_to_reported_mts (uint16_t speed_mhz)
	Converts DDR4 clock speed in MHz to the standard reported speed in MT/s. More...

Detailed Description

Utilities for decoding DDR4 SPDs.

Definition in file ddr4.h.

Macro Definition Documentation

◆ SPD_DDR4_PART_LEN

#define SPD_DDR4_PART_LEN 20

Definition at line 22 of file ddr4.h.

◆ SPD_DDR4_PART_OFF

#define SPD_DDR4_PART_OFF 329

Definition at line 21 of file ddr4.h.

Typedef Documentation

◆ spd_raw_data

typedef u8 spd_raw_data[512]

Definition at line 64 of file ddr4.h.

Enumeration Type Documentation

◆ spd_dimm_type_ddr4

enum spd_dimm_type_ddr4

Enumerator
SPD_DDR4_DIMM_TYPE_EXTENDED
SPD_DDR4_DIMM_TYPE_RDIMM
SPD_DDR4_DIMM_TYPE_UDIMM
SPD_DDR4_DIMM_TYPE_SO_DIMM
SPD_DDR4_DIMM_TYPE_LRDIMM
SPD_DDR4_DIMM_TYPE_MINI_RDIMM
SPD_DDR4_DIMM_TYPE_MINI_UDIMM
SPD_DDR4_DIMM_TYPE_72B_SO_RDIMM
SPD_DDR4_DIMM_TYPE_72B_SO_UDIMM
SPD_DDR4_DIMM_TYPE_16B_SO_DIMM
SPD_DDR4_DIMM_TYPE_32B_SO_DIMM
SPD_DDR4_DIMM_TYPE_MASK

Definition at line 28 of file ddr4.h.

Function Documentation

◆ ddr4_speed_mhz_to_reported_mts()

uint16_t ddr4_speed_mhz_to_reported_mts ( uint16_t speed_mhz )

Converts DDR4 clock speed in MHz to the standard reported speed in MT/s.

Definition at line 137 of file ddr4.c.

References ARRAY_SIZE, BIOS_ERR, ddr4_speeds, ddr4_speed_attr::max_clock_mhz, ddr4_speed_attr::min_clock_mhz, printk, and ddr4_speed_attr::reported_mts.

Referenced by ddr_speed_mhz_to_reported_mts().

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◆ spd_add_smbios17_ddr4()

enum cb_err spd_add_smbios17_ddr4	(	const u8	channel,
		const u8	slot,
		const u16	selected_freq,
		const struct dimm_attr_ddr4_st *	info
	)

Definition at line 166 of file ddr4.c.

References ARRAY_SIZE, BIOS_ERR, BIOS_WARNING, block_exists(), dimm_attr_ddr4_st::bus_width, dimm_attr_ddr4_st::cap_per_die_mbit, dimm_attr_ddr4_st::dimm_type, dimm_attr_ddr4_st::dram_type, dimm_attr_ddr4_st::manufacturer_id, memcpy(), dimm_attr_ddr4_st::part_number, printk, dimm_attr_ddr4_st::ranks, dimm_attr_ddr4_st::sdram_width, dimm_attr_ddr4_st::serial_number, dimm_attr_ddr4_st::size_mb, spd_blocks, SPD_DDR4_PART_LEN, SPD_MEMORY_TYPE_DDR4_SDRAM, SPD_MEMORY_TYPE_UNDEFINED, SPD_STATUS_CRC_ERROR, SPD_STATUS_INVALID, SPD_STATUS_OK, type, dimm_attr_ddr4_st::vdd_voltage, and verify_block().

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◆ spd_decode_ddr4()

int spd_decode_ddr4	(	struct dimm_attr_ddr4_st *	dimm,
		spd_raw_data	spd
	)

Decode the raw SPD data.

Decodes a raw SPD data from a DDR4 DIMM, and organizes it into a dimm_attr structure. The SPD data must first be read in a contiguous array, and passed to this function.

Parameters

dimm	pointer to dimm_attr structure where the decoded data is to be stored
spd	array of raw data previously read from the SPD.

Returns: spd_status enumerator SPD_STATUS_OK – decoding was successful SPD_STATUS_INVALID – invalid SPD or not a DDR4 SPD SPD_STATUS_CRC_ERROR – checksum mismatch