linux-kernel - cros_ec_lpcs cros_ec_lpcs.0: couldn't reserve memmap region

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Date:   Mon, 20 Dec 2021 15:47:37 +0100
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Benson Leung <bleung@...omium.org>
Cc:     linux-kernel@...r.kernel.org
Subject: cros_ec_lpcs cros_ec_lpcs.0: couldn't reserve memmap region

Dear Linux folks,


On the Google Chromebook Dell Latitude 5400 Chrome (google/sarien with 
Dell’s Wilco EC), enabling developer mode, and flashing a working 
TianoCore into the firmware’s RW_LEGACY region using MrChromebox’ Chrome 
OS Firmware Utility Script [1], booting a Ubuntu GNU/Linux 21.10 live 
system from USB, Linux 5.13 show the error below.

```
[    0.000000] microcode: microcode updated early to revision 0xea, date 
= 2021-01-05
[    0.000000] Linux version 5.13.0-19-generic (buildd@...01-amd64-013) 
(gcc (Ubuntu 11.2.0-7ubuntu2) 11.2.0, GNU ld (GNU Binutils for Ubuntu) 
2.37) #19-Ubuntu SMP Thu Oct 7 21:58:00 UTC 2021 (Ubuntu 
5.13.0-19.19-generic 5.13.14)
[…]
[    0.000000] DMI: Dell Inc. Sarien/Sarien, BIOS 
Google_Sarien.12200.155.0 07/29/2020
[…]
[    1.521172] cros_ec_lpcs cros_ec_lpcs.0: couldn't reserve memmap region
[    1.521213] cros_ec_lpcs: probe of cros_ec_lpcs.0 failed with error -16
[    1.524915] rtc-wilco-ec rtc-wilco-ec.2.auto: registered as rtc1
[…]
```


Kind regards,

Paul
View attachment "linux-5.13-messages.txt" of type "text/plain" (89734 bytes)