2013-07-01 18:48:59

by Eric Valette

Subject: memmap exclude boot command: how to check if it was indeed applied

Hi,

After hunting an unreproducible bug, I decided to run memtest86+ and
found that only 8 byte of memory refuse to write the last two digit on
the last 4GB memory stick.

Memory is at 0x31db357558

So I decided to add a memmap=4K@0x000000031db35000 boot options in
GRUB_CMDLINE_LINUX. But checking dmesg, I see no mention of this page
being reserved.

PS: CC me I'm not subscribed.

-- eric

2013-07-02 06:05:21

by Eric Valette

Subject: Re: memmap exclude boot command: how to check if it was indeed applied

On 01/07/2013 20:40, Eric Valette wrote:
> Hi,
>
> After hunting an unreproducible bug, I decided to run memtest86+ and
> found that only 8 byte of memory refuse to write the last two digit on
> the last 4GB memory stick.
>
> Memory is at 0x31db357558
>
> So I decided to add a memmap=4K@0x000000031db35000 boot options in
> GRUB_CMDLINE_LINUX. But checking dmesg, I see no mention of this page
> being reserved.
>
> PS: CC me I'm not subscribed.

Analysing /sys/firmware/memmap files, I see no trace of buggy address
exclusion. Any help?



--eric