CP Box Non Volatile Storage

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CP Box contains its own NVS (Non-Volatile Storage) which is loaded from main serial flash (Winbond 25Q256JVEQ) and consists of multiple partitions.

NVS structure

Offset @ NVS Offset @ Flash Size Description Sample Data Notes
0x0000 0x1C4000 0x08 Board ID (e.g. 0x2001010101010501) 20 01 01 01 01 01 04 01 Can be seen at EAP boot log
0x0021 0x1C4021 0x06 MAC address of CP Box (78:C8:81:62:A9:D6) 78 C8 81 62 A9 D6 78 C8 81 XX XX XX
0x0027 0x1C4027 0x06 2nd MAC address FF FF FF FF FF FF Used in special conditions?
0x0060 0x1C4060 0x01 DDR capacity:
  • 01 = 256 MiB
  • 02 = 512 MiB
  • 03 = 1 GiB
  • 04 = 2 GiB
  • 05 = 4 GiB
  • 06 = 8 GiB
  • 07 = 16 GiB
  • FF = 4 GiB
 05
0x0061 0x1C4061 0x01 DDR number of device 02
0x0062 0x1C4062 0x01 DDR number of rank 01
0x0063 0x1C4063 0x01 DDR device width 01
0x0064 0x1C4064 0x01 DDR bus width 02
0x0065 0x1C4065 0x01 DDR memory controller initialization mode:
  • 00 = Skip initialization at all
  • 01 = Initialize DDR3 MC
  • 02 = Initialize DDR4 MC
 00
0x00A0 0x1C40A0 0x01 Related to L2?
0x0071 0x1C4071 0x01 Related to error notifications?
0x0076 0x1C4076 0x01 Flag to toggle forced clearing of PCI-e class codes:
  • 01 = Enabled
  • otherwise = Disabled
 01 Enabled by default
0x0077 0x1C4077 0x01 Flag to toggle power sequence log:
  • 00 = Enabled
  • otherwise = Disabled
 FF Disabled by default
0x007A 0x1C407A 0x01
0x0203 0x1C4203 0x01 Related to error notifications?
0x0211 0x1C4211 0x01 GbE trace length FF
0x1010 0x1C5010 0x01 Flag to toggle EMC checksum validation for

several NVS blocks (ID, HWCTRL, THERMAL):

  • FF = Disabled
  • otherwise = Enabled
 FF Disabled by default
0x1011 0x1C5011 0x01
0x1012 0x1C5012 0x01 Flag to toggle EMC UART:
  • FF = Enabled
  • otherwise = Disabled
 FF Enabled by default
0x1014 0x1C5014 0x01 FF
0x1015 0x1C5015 0x01 FF
0x1022 0x1C5022 0x01 Flag to toggle mode:
  • FF = Normal
  • otherwise = Special (private?)
 FF Normal mode is set by default
0x1200 0x1C5200 0x0400 Error log FFs Empty by default
0x4000 0x1C8000 0x10 Serial Number (e.g. 1AR2P20000001100) 31 41 52 32 50 32 30 30 30 30 30 30 31 31 30 30
0x531F 0x1C931F 0x01 Flag to toggle EAP UART:
  • 01 = Enabled
  • otherwise = Disabled
 FF Disabled by default
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