coreboot

Using coreboot on the Asus KGPE-D16, one line for the CPU model name includes just spaces.

$ git log --oneline -1 # board status repository
4b4b7ab asus/kgpe-d16/4.5-1093-g308aeff/2017-03-01T16_03_07Z
$ git show | grep "CPU model:" | wc -l
32
$ git show | grep "CPU model:"
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
++CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
++CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
++CPU model: AMD Opteron(tm) Processor 6278
++CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model:        
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278
+CPU model: AMD Opteron(tm) Processor 6278

Here is the code in question.

$ nl -ba src/cpu/amd/family_10h-family_15h/processor_name.c
[…]
   236		if (fam15h) {
   237			/* Family 15h or later */
   238			uint32_t dword;
   239			device_t cpu_fn5_dev = dev_find_slot(0, PCI_DEVFN(0x18, 5));
   240			pci_write_config32(cpu_fn5_dev, 0x194, 0);
   241			dword = pci_read_config32(cpu_fn5_dev, 0x198);
   242			if (dword == 0) {
   243				strcpymax(program_string, sample, sizeof(program_string));
   244			} else {
   245				/* Assemble the string from PCI configuration register contents */
   246				for (i = 0; i < 12; i++) {
   247					pci_write_config32(cpu_fn5_dev, 0x194, i);
   248					p_program_string[i] = pci_read_config32(cpu_fn5_dev, 0x198);
   249				}
   250	
   251				/* Correctly place the null terminator */
   252				for (i = (NAME_STRING_MAXLEN - 2); i > 0; i--) {
   253					if (program_string[i] != 0x20)
   254						break;
   255				}
   256				program_string[i + 1] = 0;
   257			}
   258		} else {
   259			/* variable names taken from fam10 revision guide for clarity */
   260			u32 BrandId;	/* CPUID Fn8000_0001_EBX */
   261			u8 String1;	/* BrandID[14:11] */
   262			u8 String2;	/* BrandID[3:0] */
   263			u8 Model;	/* BrandID[10:4] */
   264			u8 Pg;		/* BrandID[15] */
   265			u8 PkgTyp;	/* BrandID[31:28] */
   266			u8 NC;		/* CPUID Fn8000_0008_ECX */
   267			const char *processor_name_string = unknown;
   268			int j = 0, str2_checkNC = 1;
   269			const struct str_s *str, *str2;
   270	
   271			/* Find out which CPU brand it is */
   272			BrandId = cpuid_ebx(0x80000001);
   273			String1 = (u8)((BrandId >> 11) & 0x0F);
   274			String2 = (u8)((BrandId >> 0) & 0x0F);
   275			Model = (u8)((BrandId >> 4) & 0x7F);
   276			Pg = (u8)((BrandId >> 15) & 0x01);
   277			PkgTyp = (u8)((BrandId >> 28) & 0x0F);
   278			NC = (u8)(cpuid_ecx(0x80000008) & 0xFF);
   279	
   280			if (!Model) {
   281				processor_name_string = Pg ? thermal : sample;
   282				goto done;
   283			}
   284	
   285			switch (PkgTyp) {
   286			case 0:		/* F1207 */
   287				str = String1_socket_F;
   288				str2 = String2_socket_F;
   289				str2_checkNC = 0;
   290				break;
   291			case 1:		/* AM2 */
   292				str = String1_socket_AM2;
   293				str2 = String2_socket_AM2;
   294				break;
   295			case 3:		/* G34 */
   296				str = String1_socket_G34;
   297				str2 = String2_socket_G34;
   298				str2_checkNC = 0;
   299				break;
   300			case 5:		/* C32 */
   301				str = String1_socket_C32;
   302				str2 = String2_socket_C32;
   303				break;
   304			default:
   305				goto done;
   306			}
   307	
   308			/* String1 */
   309			for (i = 0; str[i].value; i++) {
   310				if ((str[i].Pg == Pg) &&
   311				(str[i].NC == NC) &&
   312				(str[i].String == String1)) {
   313					processor_name_string = str[i].value;
   314					break;
   315				}
   316			}
   317	
   318			if (!str[i].value)
   319				goto done;
   320	
   321			j = strcpymax(program_string, processor_name_string,
   322				sizeof(program_string));
   323	
   324			/* Translate Model from 01-99 to ASCII and put it on the end.
   325			* Numbers less than 10 should include a leading zero, e.g., 09.*/
   326			if (Model < 100 && j < sizeof(program_string) - 2) {
   327				program_string[j++] = (Model / 10) + '0';
   328				program_string[j++] = (Model % 10) + '0';
   329			}
   330	
   331			processor_name_string = unknown2;
   332	
   333			/* String 2 */
   334			for (i = 0; str2[i].value; i++) {
   335				if ((str2[i].Pg == Pg) &&
   336				((str2[i].NC == NC) || !str2_checkNC) &&
   337				(str2[i].String == String2)) {
   338					processor_name_string = str2[i].value;
   339					break;
   340				}
   341			}
   342	
   343	done:
   344			strcpymax(&program_string[j], processor_name_string,
   345				sizeof(program_string) - j);
   346		}
   347	
   348		printk(BIOS_DEBUG, "CPU model: %s\n", program_string);
[…]