22.9.11 Boot Configuration 0
Name: | BCFG0 |
Offset: | 0x200 |
Reset: | 0x00 |
Property: | - |
Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
BINFOVALID0 | SIGN | CP | |||||||
Access | R | R | R | ||||||
Reset | c | c | c |
Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
Access | |||||||||
Reset |
Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
Access | |||||||||
Reset |
Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
PCSCMODE | |||||||||
Access | R | ||||||||
Reset | c |
Bit 31 – BINFOVALID0 First 256-bit BCFG Information is Valid
Note:
- This bit is added to know if the information from Flash is valid or invalid. The BCFG area is critical to device boot-up.
- Trusted FBCFG* data = (BINFOVALID =
0
) and (BCFGFAIL =0
). - It is recommended for the application to program this bit to ‘
0
’ for proper operation.
Value | Description |
---|---|
1 | FBCFG0 to FBCFG7 is not valid (Untrusted, flash values are ignored and safe values are used) |
0 | FBCFG0 to FBCFG7 is valid (Trusted and loaded from Flash) |
Bit 29 – SIGN Flash SIGN Bit
This bit is a read only bit. Reading this bit returns the value of the SIGN bit in the FSIGN0 fuse location (invisible to user) in the NVR memory.
Value | Description |
---|---|
1 | Unsigned |
0 | Signed |
Bit 28 – CP Code Protect
1
’.Value | Description |
---|---|
1 | Protection enabled |
0 | Protection disabled |
Bit 1 – PCSCMODE PCHE Single Cache Mode
Note: This bit must be changed only when there are no active accesses to Flash from CPU. If this bit is changed while the CPU is accessing Flash, a system hang may result.
Value | Description |
---|---|
1 | PCHE ICache Only. CPU Instructions (code, data) go to PCHE ICache only. |
0 | PCHE ICache and DCache. CPU opcodes go to PCHE ICache port and data goes to PCHE DCache port. |