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Re: Booting from NVMe controller enters GRUB rescue

From: Andrey Borzenkov
Subject: Re: Booting from NVMe controller enters GRUB rescue
Date: Fri, 10 Jan 2014 17:40:58 +0400

On Fri, Jan 10, 2014 at 3:48 PM, vinayak holikatti
<address@hidden> wrote:
> On Fri, Jan 10, 2014 at 1:47 PM, Andrey Borzenkov <address@hidden> wrote:
>> On Fri, Jan 10, 2014 at 10:53 AM, vinayak holikatti
>> <address@hidden> wrote:
>>> Hi All,
>>> We have developed Legacy OptionROM for NVMe controller device. We are
>>> able to boot to all Windows 7 and later OS. But we are facing issue in
>>> booting Fedora 20 x86_64 OS. Fedora 20 gets installed successfully on
>>> NVMe device. While booting from NVMe device we are observing error as
>>> follows and enters grub rescue. We are clueless about what is
>>> happening here. We would like to know how to over come this issue and
>>> boot to Fedora 20 OS from our controller.
>>> "error : no such device: 44d1bf09-4e8a-4f46-aea6-09e364abf5cb.
>>>  Entering rescue mode...
>>>  grub_rescue>"
>> GRUB cannot find filesystem with UUID printed. Some of required
>> drivers are missing in core.img. What is NVMe? Could you give more
>> information (is it BIOS compatible? Are you using HDD or some other
>> media? What is disk layout - any MD, LVM or other RAID partitions?)
> Hi Andrey,
> We have taken a log of Bootinfo script as below. Non Volatile Memory
> Express(NVMe) is PCIe based
> controller. In Linux kernel for this controller there is a driver
> module present with name nvme.ko. We will
> start looking at core.img. There is no BIOS support for this device as
> it is a PCIe plug and play
> device. We have our Legacy OptionROM support for booting from this controller.

Does this Legacy OptionROM emulate BIOS disk access? I.e. is this
device visible as HDD in BIOS?

On BIOS platform GRUB is using biosdisk module; it relies on BIOS disk
calls (INT 13). I think I remember cases when it was not completely
implemented by option ROMs.

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