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Tool/software:
Greetings All,
In MCU PLUS SDK offering, across Sitara SoCs, one must have come across different configuration files.
These configuration files are located inside the directory: MCU_PLUS_SDK_INSTALL_PATH\tools\boot\sbl_prebuilt
In some of the configuration(.cfg) files, there is a line introduced namely:
--operation=flash-phy-tuning-data
Let us understand what is the purpose of this.
Best Regards,
Vaibhav
Please understand what is OSPI Phy Tuning and why is it required by going through the following FAQ: https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1431856/faq-am62a7-ospi-phy-tuning-algorithm
If you go through this, it will be much easier to understand the subsequent explanation.
Now that you are familiar with what the Phy Tuning Algorithm is, let's continue.
In the process of phy tuning, we try different combinations of rxDLL, txDLL and readDelay values and read some bytes from the flash part.
If the value is read correctly then its marked as positive else negative(for when the value is not read back).
This value/bytes must be:
So that when we read it back we can compare with the original known data at our end.
This value is basically 128 bytes of data which is predefined in the file named ospi_phy.c(NOTE: This file is renamed to ospi_phy_dqs.c in some of the MCU PLUS SDKs but serves the same purpose).
static uint8_t gOspiFlashAttackVector[OSPI_FLASH_ATTACK_VECTOR_SIZE] =
{
0xFEU, // 0b11111110 @ 0x00000400 1024 bytes
0xFF, // 0b11111111 @ 0x00000401 1025 bytes
// Even Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 000000011
0x01, // 0b00000001 @ 0x00000402 1026 bytes
0x01, // 0b00000001 @ 0x00000403 1027 bytes
0x01, // 0b00000001 @ 0x00000404 1028 bytes
0x01, // 0b00000001 @ 0x00000405 1029 bytes
0x01, // 0b00000001 @ 0x00000406 1030 bytes
0x00, // 0b00000000 @ 0x00000407 1031 bytes
0x00, // 0b00000000 @ 0x00000408 1032 bytes
0xFE, // 0b11111110 @ 0x00000409 1033 bytes
0xFE, // 0b11111110 @ 0x0000040A 1034 bytes
// Odd Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 000000011
0x01, // 0b00000001 @ 0x0000040B 1035 bytes
0x01, // 0b00000001 @ 0x0000040C 1036 bytes
0x01, // 0b00000001 @ 0x0000040D 1037 bytes
0x01, // 0b00000001 @ 0x0000040E 1038 bytes
0x00, // 0b00000000 @ 0x0000040F 1039 bytes
0x00, // 0b00000000 @ 0x00000410 1040 bytes
0xFE, // 0b11111110 @ 0x00000411 1041 bytes
0xFE, // 0b11111110 @ 0x00000412 1042 bytes
0x01, // 0b00000001 @ 0x00000413 1043 bytes
// Even Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 111110011
0xFF, // 0b11111111 @ 0x00000414 1044 bytes
0xFF, // 0b11111111 @ 0x00000415 1045 bytes
0xFF, // 0b11111111 @ 0x00000416 1046 bytes
0xFF, // 0b11111111 @ 0x00000417 1047 bytes
0xFF, // 0b11111111 @ 0x00000418 1048 bytes
0x00, // 0b00000000 @ 0x00000419 1049 bytes
0x00, // 0b00000000 @ 0x0000041A 1050 bytes
0xFE, // 0b11111110 @ 0x0000041B 1051 bytes
0xFE, // 0b11111110 @ 0x0000041C 1052 bytes
// Odd Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 111110011
0xFF, // 0b11111111 @ 0x0000041D 1053 bytes
0xFF, // 0b11111111 @ 0x0000041E 1054 bytes
0xFF, // 0b11111111 @ 0x0000041F 1055 bytes
0xFF, // 0b11111111 @ 0x00000420 1056 bytes
0x00, // 0b00000000 @ 0x00000421 1057 bytes
0x00, // 0b00000000 @ 0x00000422 1058 bytes
0xFE, // 0b11111110 @ 0x00000423 1059 bytes
0xFE, // 0b11111110 @ 0x00000424 1060 bytes
0xFF, // 0b11111111 @ 0x00000425 1061 bytes
// Even Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 000001011
0x01, // 0b00000001 @ 0x00000426 1062 bytes
0x01, // 0b00000001 @ 0x00000427 1063 bytes
0x01, // 0b00000001 @ 0x00000428 1064 bytes
0x01, // 0b00000001 @ 0x00000429 1065 bytes
0x01, // 0b00000001 @ 0x0000042A 1066 bytes
0xFE, // 0b11111110 @ 0x0000042B 1067 bytes
0x00, // 0b00000000 @ 0x0000042C 1068 bytes
0xFE, // 0b11111110 @ 0x0000042D 1069 bytes
0xFE, // 0b11111110 @ 0x0000042E 1070 bytes
// Odd Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 000001011
0x01, // 0b00000001 @ 0x0000042F 1071 bytes
0x01, // 0b00000001 @ 0x00000430 1072 bytes
0x01, // 0b00000001 @ 0x00000431 1073 bytes
0x01, // 0b00000001 @ 0x00000432 1074 bytes
0xFE, // 0b11111110 @ 0x00000433 1075 bytes
0x00, // 0b00000000 @ 0x00000434 1076 bytes
0xFE, // 0b11111110 @ 0x00000435 1077 bytes
0xFE, // 0b11111110 @ 0x00000436 1078 bytes
0x01, // 0b00000001 @ 0x00000437 1079 bytes
// Even Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 111111011
0xFF, // 0b11111111 @ 0x00000438 1080 bytes
0xFF, // 0b11111111 @ 0x00000439 1081 bytes
0xFF, // 0b11111111 @ 0x0000043A 1082 bytes
0xFF, // 0b11111111 @ 0x0000043B 1083 bytes
0xFF, // 0b11111111 @ 0x0000043C 1084 bytes
0xFE, // 0b11111110 @ 0x0000043D 1085 bytes
0x00, // 0b00000000 @ 0x0000043E 1086 bytes
0xFE, // 0b11111110 @ 0x0000043F 1087 bytes
0xFE, // 0b11111110 @ 0x00000440 1088 bytes
// Odd Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 111111011
0xFF, // 0b11111111 @ 0x00000441 1089 bytes
0xFF, // 0b11111111 @ 0x00000442 1090 bytes
0xFF, // 0b11111111 @ 0x00000443 1091 bytes
0xFF, // 0b11111111 @ 0x00000444 1092 bytes
0xFE, // 0b11111110 @ 0x00000445 1093 bytes
0x00, // 0b00000000 @ 0x00000446 1094 bytes
0xFE, // 0b11111110 @ 0x00000447 1095 bytes
0xFE, // 0b11111110 @ 0x00000448 1096 bytes
0xFF, // 0b11111111 @ 0x00000449 1097 bytes
// Even Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 000000111
0x01, // 0b00000001 @ 0x0000044A 1098 bytes
0x01, // 0b00000001 @ 0x0000044B 1099 bytes
0x01, // 0b00000001 @ 0x0000044C 1100 bytes
0x01, // 0b00000001 @ 0x0000044D 1101 bytes
0x01, // 0b00000001 @ 0x0000044E 1102 bytes
0x00, // 0b00000000 @ 0x0000044F 1103 bytes
0xFE, // 0b11111110 @ 0x00000450 1104 bytes
0xFE, // 0b11111110 @ 0x00000451 1105 bytes
0xFE, // 0b11111110 @ 0x00000452 1106 bytes
// Odd Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 000000111
0x01, // 0b00000001 @ 0x00000453 1107 bytes
0x01, // 0b00000001 @ 0x00000454 1108 bytes
0x01, // 0b00000001 @ 0x00000455 1109 bytes
0x01, // 0b00000001 @ 0x00000456 1110 bytes
0x00, // 0b00000000 @ 0x00000457 1111 bytes
0xFE, // 0b11111110 @ 0x00000458 1112 bytes
0xFE, // 0b11111110 @ 0x00000459 1113 bytes
0xFE, // 0b11111110 @ 0x0000045A 1114 bytes
0x01, // 0b00000001 @ 0x0000045B 1115 bytes
// Even Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 111110111
0xFF, // 0b11111111 @ 0x0000045C 1116 bytes
0xFF, // 0b11111111 @ 0x0000045D 1117 bytes
0xFF, // 0b11111111 @ 0x0000045E 1118 bytes
0xFF, // 0b11111111 @ 0x0000045F 1119 bytes
0xFF, // 0b11111111 @ 0x00000460 1120 bytes
0x00, // 0b00000000 @ 0x00000461 1121 bytes
0xFE, // 0b11111110 @ 0x00000462 1122 bytes
0xFE, // 0b11111110 @ 0x00000463 1123 bytes
0xFE, // 0b11111110 @ 0x00000464 1124 bytes
// Odd Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 111110111
0xFF, // 0b11111111 @ 0x00000465 1125 bytes
0xFF, // 0b11111111 @ 0x00000466 1126 bytes
0xFF, // 0b11111111 @ 0x00000467 1127 bytes
0xFF, // 0b11111111 @ 0x00000468 1128 bytes
0x00, // 0b00000000 @ 0x00000469 1129 bytes
0xFE, // 0b11111110 @ 0x0000046A 1130 bytes
0xFE, // 0b11111110 @ 0x0000046B 1131 bytes
0xFE, // 0b11111110 @ 0x0000046C 1132 bytes
0xFF, // 0b11111111 @ 0x0000046D 1133 bytes
// Even Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 000001111
0x01, // 0b00000001 @ 0x0000046E 1134 bytes
0x01, // 0b00000001 @ 0x0000046F 1135 bytes
0x01, // 0b00000001 @ 0x00000470 1136 bytes
0x01, // 0b00000001 @ 0x00000471 1137 bytes
0x01, // 0b00000001 @ 0x00000472 1138 bytes
0xFE, // 0b11111110 @ 0x00000473 1139 bytes
0xFE, // 0b11111110 @ 0x00000474 1140 bytes
0xFE, // 0b11111110 @ 0x00000475 1141 bytes
0xFE, // 0b11111110 @ 0x00000476 1142 bytes
// Odd Aligned Victim bit: 0, vic time slice : 111110000, agr time slice : 000001111
0x01, // 0b00000001 @ 0x00000477 1143 bytes
0x01, // 0b00000001 @ 0x00000478 1144 bytes
0x01, // 0b00000001 @ 0x00000479 1145 bytes
0x01, // 0b00000001 @ 0x0000047A 1146 bytes
0xFE, // 0b11111110 @ 0x0000047B 1147 bytes
0xFE, // 0b11111110 @ 0x0000047C 1148 bytes
0xFE, // 0b11111110 @ 0x0000047D 1149 bytes
0xFE, // 0b11111110 @ 0x0000047E 1150 bytes
0x01 // 0b00000001 @ 0x0000047F 1151 bytes
};
When, in a config file, --operation=flash-phy-tuning-data is written, it basically at driver level, writes this known 128 bytes to the flash part at some known offset.
The reason being, while we do phy tuning, we can read this value back for different combinations of rxDLL, txDLL and readDelay(NOTE: sometimes referred as rdDelay) and eventually find the Optimal Tuning Point(OTP).