18.4.10 Boot Configuration 0
Note: Safe value of BCFG0 is 0xFFFF_FFFF as applicable only to the implemented
bits.
| 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 provide a mechanism to determine if information coming from Flash is valid or invalid. The BCFG area is critical to the device boot-up.
- Trusted FBCFG* data =
(BINFOVALID =
0) and (BCFGFAIL =0). - It is recommended that the application program this bit to zero for proper operation.
| Value | Description |
|---|---|
| 1 | FBCFG0 to FBCFG5 is not valid (Untrusted, Flash values are ignored and safe values are used) |
| 0 | FBCFG0 to FBCFG5 is valid (Trusted and loaded from Flash) |
Bit 29 – SIGN Flash SIGN bit
| Value | Description |
|---|---|
| 1 | Unsigned |
| 0 | Signed |
Bit 28 – CP Boot Code Protect (~FCPN0.CPN && ~FSIGN0.SIGN).
| Value | Description |
|---|---|
| 1 | Protection is enabled |
| 0 | Protection is disabled |
Bit 1 – PCSCMODE PCHE Single Cache mode
| Value | Description |
|---|---|
| 1 | PCHE ICache Only. CPU Instructions (code, data) go to PCHE ICache only. |
| 0 | PCHE ICache and DCache. CPU opcodes go to PCEHE ICache port and data goes to PCHE DCache port. |