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List:       freebsd-hackers
Subject:    Controller timeout in SDHCI
From:       Christopher Bowman <crb () chrisbowman ! com>
Date:       2022-09-16 21:31:45
Message-ID: 6F53CEFE-E4CC-452B-A64C-F312A550C40F () chrisbowman ! com
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I am working on a Xilinx ZYNQ (ARM cortex A9) based board.  I have a 13.0 setup \
working but my freshly build 13.1 doesn't boot. Upon boot while probing and attaching \
devices I get the following message which 

sdhci_fdt0-slot0: Controller timeout
sdhci_fdt0-slot0: ============== REGISTER DUMP ==============
sdhci_fdt0-slot0: Sys addr: 0x00060000 | Version:  0x00008901
sdhci_fdt0-slot0: Blk size: 0x00005008 | Blk cnt:  0x00000001
sdhci_fdt0-slot0: Argument: 0x00000000 | Trn mode: 0x00000013
sdhci_fdt0-slot0: Present:  0x01ff0202 | Host ctl: 0x00000001
sdhci_fdt0-slot0: Power:    0x0000000f | Blk gap:  0x00000000
sdhci_fdt0-slot0: Wake-up:  0x00000000 | Clock:    0x00004007
sdhci_fdt0-slot0: Timeout:  0x00000006 | Int stat: 0x00000001
sdhci_fdt0-slot0: Int enab: 0x01ff00fb | Sig enab: 0x01ff00fa
sdhci_fdt0-slot0: AC12 err: 0x00000000 | Host ctl2:0x00000000
sdhci_fdt0-slot0: Caps:     0x69ec0080 | Caps2:    0x00000000
sdhci_fdt0-slot0: Max curr: 0x00000001 | ADMA err: 0x00000000
sdhci_fdt0-slot0: ADMA addr:0x00000000 | Slot int: 0x00000000
sdhci_fdt0-slot0: ===========================================

This whole section repeats and the only register which seems to change is the Sys \
addr which goes to 0.

I imagine that the interrupt which signals a completion of a SDHCI read is probably \
not getting back to the driver and thus the timeout triggers but I'm not sure.

I believe the FDT for the working and 13.0 and the failing 13.1 are identical.

If anyone has any suggestions as to where to start looking that would be greatly \
appreciated.

Regards,
Christopher


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