Comments (3)
The UART switch button appears to not work until the machine has been powered up at least once. It is not clear if this can be driven from the BMC straight away without powering up the machine, but at least there is more data about this.
Running gpiowatcher over ssh after a powercycle and pushing the cycle button shows no pin transitions. Powering the machine and then pushing shows the transitions as they should.
1970/01/01 00:01:36 ROMOE#/GPIOS4 sensing high
1970/01/01 00:01:36 ROMOE#/GPIOS4 sensing low
# Press cycle uart multiple times, no response
# grpc_cli call 10.0.10.20:80 ManagementService.PressButton 'button: BUTTON_POWER, duration_ms: 1000'
1970/01/01 00:01:43 BMC_PWR_BTN_OUT_N driving low
1970/01/01 00:01:43 SLP_S3_N sensing high
1970/01/01 00:01:43 GPIOG3/SGPSI1 sensing high
1970/01/01 00:01:43 GPIOB1/SALT2 sensing high
1970/01/01 00:01:43 GPIOD6/SD2CD# sensing high
1970/01/01 00:01:43 CPU_CATERR_N sensing high
1970/01/01 00:01:43 GPION3/PWM3/VPIG3 sensing high
1970/01/01 00:01:43 CPU0_PROCHOT_N sensing high
1970/01/01 00:01:43 CPU1_PROCHOT_N sensing high
1970/01/01 00:01:43 GPIOB4/LPCRST# sensing high
1970/01/01 00:01:43 PCH_PWR_OK sensing high
1970/01/01 00:01:43 SYS_PWR_OK sensing high
[...]
# Press cycle uart
1970/01/01 00:01:45 GPIOL7/RXD1/VPIB1 sensing low
1970/01/01 00:01:45 UART_SELECT0 sensing high
I'll close this for now as it appears things are working OK for a v1.0.
from u-bmc.
Another datapoint: shutting down the machine will once again lock the cycle logic.
I know that other BMC software clocks some pins from software. Could it be related?
Next step: Verify behavior with stock BMC software.
from u-bmc.
Stock BMC software behaves the same. If the host is powered off UART switching does not occur.
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