shtirlic commented on PR #16424:
URL: https://github.com/apache/nuttx/pull/16424#issuecomment-3173751275
@cederom there are some pages in rp2350 datasheet `5.1.20. Automatic
Architecture Switching` and `3.9. Arm/RISC-V Architecture Switching` and for
my board as I remember I set the ARCHSEL OTP register with optiion 4.
```
1. If CRIT0_ARM_DISABLE is set, only RISC-V is allowed.
2. Else if CRIT0_RISCV_DISABLE is set, only Arm is allowed.
3. Else if CRIT1_SECURE_BOOT_ENABLE is set, only Arm is allowed.
4. Else if CRIT1_BOOT_ARCH is set, both architectures are permitted, and the
default is RISC-V.
5. If none of the above flags are set, both architectures are permitted, and
the default is Arm.
No CRIT1 flags are set by default, so on devices where both architectures
are available, the default is Arm. To change the
default architecture to RISC-V, set the CRIT1_BOOT_ARCH flag to 1.
```
my OTP looks like this, see the BOOT_ARCH bit set to 1
```
luksdev> picotool otp get OTP_DATA_CRIT1
ROW 0x0040: OTP_DATA_CRIT1
"Page 1 critical boot flags (RBIT-8)"
VALUE 0x000008
field GLITCH_DETECTOR_SENS (bits 5-6) = 0
"Increase the sensitivity of the glitch detectors from their
default."
field GLITCH_DETECTOR_ENABLE (bit 4) = 0
"Arm the glitch detectors to reset the system if an abnormal
clock/power event is observed."
field BOOT_ARCH (bit 3) = 1
"Set the default boot architecture, 0=ARM 1=RISC-V. Ignored if
ARM_DISABLE, RISCV_DISABLE or SECURE_BOOT_ENABLE is set."
field DEBUG_DISABLE (bit 2) = 0
"Disable all debug access"
field SECURE_DEBUG_DISABLE (bit 1) = 0
"Disable Secure debug access"
field SECURE_BOOT_ENABLE (bit 0) = 0
"Enable boot signature enforcement, and permanently disable the
RISC-V cores."
```
and `picotool info -a`
```
Device Information
type: RP2350
revision: A2
package: QFN60
chipid: 0x87485d01e86f300a
flash devinfo: 0x0c00
current cpu: RISC-V
available cpus: ARM, RISC-V
default cpu: RISC-V
secure boot: 0
debug enable: 1
secure debug enable: 1
boot_random: c403df64:02852428:7ac04dce:1d37e89f
boot type: bootsel
last booted partition: none
diagnostic source: slot 0
last boot diagnostics: 0x00000000
reboot param 0: 0x00000000
reboot param 1: 0x00000000
rom gitrev: 0x312e22fa
flash size: 4096K
```
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