diff options
| author | Ian Moffett <ian@osmora.org> | 2025-10-12 20:01:14 -0400 |
|---|---|---|
| committer | Ian Moffett <ian@osmora.org> | 2025-10-12 20:32:00 -0400 |
| commit | ad8adc4165375a2e803be6d5782477c9f88d717e (patch) | |
| tree | 799431076566f7290e630f17c2224d538aa4cb41 | |
| parent | da3aa8b99fea249422b78827edee1a9ffb990494 (diff) | |
docs: Describe "bring up area" and ROM details
Signed-off-by: Ian Moffett <ian@osmora.org>
| -rw-r--r-- | README.md | 7 |
1 files changed, 7 insertions, 0 deletions
@@ -209,6 +209,13 @@ A value of 0b1 indicates an immediate value is used for the second operand (``IMM_OP``) and a value of 0b0 indicates a register is used for the second operand (``REG_OP``). +### Bring up area + +Upon power up, all general purpose registers (excluding x0), as well as the stack pointer +and frame pointer registers are to all go high (all 1s), PC is to be set to an initial value +of 0xFFF00000 referencing whats known as the "bring up area" containing platform firmware and +initialization code located in the ROM. + ### Opcode list - `NOP`: `0x00` |