I can not understand the connection between the RP1 chip on Raspberry 5 and the Raspberry 1 microcomputer. Are those two are a same one chip which is used as a CPU in Raspberry 1 and as a north bridge in Rasbperry 5?
No, those are different chips entirely. RP1 is an entirely new chip that serves as a southbridge on Raspberry Pi 5. The original Raspberry Pi had a BCM2835 SoC. Raspberry Pi 5 has a BCM2712 SoC.
