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port-evbarm/56376: eMMC regression on odroid C2 (aarch64) NetBSD 9 --> NetBSD HEAD (9.99.88)

>Number:         56376
>Category:       port-evbarm
>Synopsis:       eMMC module no longer works on odroid c2 under NetBSD HEAD (9.99.88)
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    port-evbarm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Aug 26 07:00:00 +0000 2021
>Originator:     Markus Kilbinger
>Release:        NetBSD 9.99.88
System: NetBSD cochise 9.99.88 NetBSD 9.99.88 (C2) #9: Tue Aug 24 10:15:54 CEST 2021 root@c2:/usr/NetBSD/HEAD/src/sys/arch/evbarm/compile/C2 evbarm
Architecture: aarch64
Machine: evbarm
	An installed eMMC module in my odroid c2 is no longer
	correctly detected / initialised /working under NetBSD
	-current (HEAD 9.99.88):

	  sdmmc1: can't re-read EXT_CSD
	  sdmmc1: mem init failed
	  sdmmc1: init failed

	Its sdcard works normally though:

	  sdmmc0: SD card status: 4-bit, C10, U3, V30, A2
	  ld0 at sdmmc0: <0x03:0x5344:SH64G:0x80:0x1ed4d81b:0x156>
	  ld0: 60906 MB, 7764 cyl, 255 head, 63 sec, 512 bytes/sect x 124735488 sectors
	  ld0: 4-bit width, High-Speed/SDR25, 50.000 MHz

	Under NetBSD 9 it's detected und working normally:

	  ld1 at sdmmc1: <0x15:0x0100:CJTD4R:0x00:0x0dd2be1c:0x000>
	  ld1: 59640 MB, 7603 cyl, 255 head, 63 sec, 512 bytes/sect x 122142720 sectors
	  ld1: 8-bit width, HS200, 64 MB cache, 200.000 MHz
	Boot a -current GENERIC64 aarch kernel on a odroid c2 and
	watch it failing to detect its installed eMMC module.


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