I was trying to write a new host phase1 to flash on cosmo-os from alfred, and three attempts in a row failed with
variants of this.
alfred(cosmo-os)% h qspi -D /staff/andy/os/cosmo.rom && cycle
humility: attached to 1fc9:0143:WTECYVHYHSQD4 via CMSIS-DAP V1
humility: Using existing slot settings
2026-06-23T16:47:17.459592Z ERROR probe_rs::probe::cmsisdap::commands::transfer: Transfer count larger than requested number of transfers
2026-06-23T16:47:17.459834Z WARN probe_rs::session: Could not clear all hardware breakpoints: An ARM specific error occurred.
Caused by:
0: The debug probe encountered an error.
1: An error which is specific to the debug probe in use occurred.
2: Error handling CMSIS-DAP command Transfer.
3: Unexpected answer to command.
2026-06-23T16:47:17.461481Z WARN probe_rs::probe::cmsisdap: CMSIS_DAP: Only 1/2 transfers were executed, but no error was reported.
2026-06-23T16:47:17.461579Z WARN probe_rs::session: Failed to deconfigure device during shutdown: Arm(Other("Possible error in CMSIS-DAP probe: Only 1/2 transfers were executed, but no error was reported."))
2026-06-23T16:47:17.461974Z WARN probe_rs::probe::cmsisdap: CMSIS_DAP: Only 2/3 transfers were executed, but no error was reported.
humility qspi failed: An ARM specific error occurred.
Caused by:
0: The debug probe encountered an error.
1: An error which is specific to the debug probe in use occurred.
2: Error handling CMSIS-DAP command Transfer.
3: Timeout in USB communication.
alfred(cosmo-os)% h qspi -D /staff/andy/os/cosmo.rom && cycle
humility: attached to 1fc9:0143:WTECYVHYHSQD4 via CMSIS-DAP V1
humility: Using existing slot settings
humility: skipping sector 0
humility: erased 9.88 MiB in 12 seconds
2026-06-23T16:59:29.475567Z WARN probe_rs::session: Could not clear all hardware breakpoints: An ARM specific error occurred.
Caused by:
0: The debug probe encountered an error.
1: An error which is specific to the debug probe in use occurred.
2: Error handling CMSIS-DAP command Transfer.
3: Timeout in USB communication.
2026-06-23T16:59:29.526139Z WARN probe_rs::session: Failed to deconfigure device during shutdown: Arm(Probe(ProbeSpecific(BoxedProbeError(Send { command_id: Transfer, source: Timeout }))))
humility qspi failed: An ARM specific error occurred.
Caused by:
0: Error using access port FullyQualifiedApAddress { dp: Default, ap: V1(0) }.
1: Failed to read register DRW at address 0xd0c
2: The debug probe encountered an error.
3: An error which is specific to the debug probe in use occurred.
4: Error handling CMSIS-DAP command Transfer.
5: Timeout in USB communication.
alfred(cosmo-os)%
I then grabbed the humility binary from igor which just reports as 0.13.0 and that succeeded first time:
alfred(cosmo-os)% pfexec ./humility qspi -D /staff/andy/os/cosmo.rom
humility: attached to 1fc9:0143:WTECYVHYHSQD4 via CMSIS-DAP V1
humility: Using existing slot settings
humility: skipping sector 0
humility: erased 3.19 MiB in 3 seconds
humility: hashed 32.00 MiB, wrote 3.19 MiB in 6 minutes
I was trying to write a new host phase1 to flash on
cosmo-osfromalfred, and three attempts in a row failed withvariants of this.
I then grabbed the
humilitybinary fromigorwhich just reports as0.13.0and that succeeded first time: