How to attach and read some registers without knowing the exact chip model

[HalfSweet]

Is your feature request related to a problem? Please describe. I would like to connect and read certain registers through the debugger to get other complete information when I don't know specific information about a chip. For example, IDCODE of the kernel, DBG_IDCODE of the STM32 series, and other specific registers to find out roughly the model of the chip I'm connecting to

Describe the solution you'd like Hopefully some sort of interface can be provided to read it when the exact model is not known

Describe alternatives you've considered I tried using probe_rs::Session::auto_attach, where target I set to TargetSelector::Auto, but this doesn't seem to work and returns ChipNotFound(ChipAutodetectFailed). This is my code:

use probe_rs::{flashing, Session, Permissions, MemoryInterface, Probe, Lister};
use probe_rs::config::TargetSelector;

fn main() {
    let mut session = Session::auto_attach(TargetSelector::Auto, Permissions::default()).unwrap();

}

I also tried using attach_to_unspecified in probe_rs::Probe, but it returns Result<(), Error>, which I am confused about and don't know what to do next

Additional context

[Yatekii]

You can just use let mut session = Session::auto_attach("<target_name>", Permissions::default()).unwrap();.

[elfmimi]

In the case of pyOCD , there is cortex_m target. which is guaranteed to be able to connect to any variant of the ARM Cortex series cores. For probe-rs , I suppose specifying cortex-m0 can connect to other cortex-m variants such as cortex-m4 too.

But it is nice to have some sort of auto target and to be able to read/write memory and registers, for ARM and RISC-V target alike.

[HalfSweet]

Thank you very much @elfmimi for the solution, after trying it out I found that it works fine on chips with cortex-M0+/M3/M4 cores. Do I need to disable this issue?

[elfmimi]

Let me just point out there is an exception. ( there always be. ) That is there exist kind of target which requires TARGETSEL sequence before making a connection. The well known one is RP2040. RP2040 cannot be connected with specifying --chip cortex-m0.