Re: Grub saved my Laptop, and made it usable. so i wanted to say thanks to everybody that worked on it.

[James Wabi]

Thanks vladimir, sadly it did not work. What i did was to include the memmap line like this on boot/grub/grub.cfg


# This Menu entry brought to you courtesy of https://www.pendrivelinux.com/install-grub2-on-usb-from-ubuntu-linux/
set timeout=10
set default=0

menuentry "Run Ubuntu Live ISO" {
 loopback loop /ubuntu.iso
 linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=/ubuntu.iso splash -- memmap=16K\\\$0x0000000B4018000,16K\\\$0x0000000B2018000,4K\\\$0x0000000B401C000,4K\\\$0x0000000B201C000
 initrd (loop)/casper/initrd
}

Then i booted ubuntu from live usb, and i wanted to double check if those areas in the memory were reserved. So i opened terminal, and executed :  dmesg
A long list of reserved things were displayed but nothing related to those specific memory addresses.

regards!

On Mon, Nov 7, 2022 at 12:43 AM Vladimir 'phcoder' Serbinenko <phcoder@gmail.com> wrote:

On Mon, Nov 7, 2022 at 2:54 AM James Wabi <imitomx1978@gmail.com> wrote:
>
> Hi Vladimir
> thank you for your response,
>
> I managed to follow this guide from start to end, and i have a bootable USB flash drive with grub and also with the ubuntu.iso in it, just like you explained.
> tutorial:  https://www.pendrivelinux.com/install-grub2-on-usb-from-ubuntu-linux/
>
> Inside my usb flash drive, the contents on the boot/grub/grub.cfg are:
> --------------
>
> # This Menu entry brought to you courtesy of https://www.pendrivelinux.com/install-grub2-on-usb-from-ubuntu-linux/
> set timeout=10
> set default=0
>
> menuentry "Run Ubuntu Live ISO" {
>  loopback loop /ubuntu.iso
>  linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=/ubuntu.iso splash --
>  initrd (loop)/casper/initrd
> }
>
> --------------
> Now my quesiton is, where should i add this line?:
> memmap=8K\\\$0x00000005A00C000,4K\\\$0x00000005A00E000,8K\\\$0x00000005C00C000,4K\\\$0x00000005C00E000
>
>
> That line above is the fix for my memory in grub.cfg but i don´t know where to put it.
>
> On a pc where linux has already been installed into the hard drive, the line would look something similar to this:
>
> GRUB_CMDLINE_LINUX_DEFAULT="quiet splash memmap=8K\\\$0x00000005A00C000,4K\\\$0x00000005A00E000,8K\\\$0x00000005C00C000,4K\\\$0x00000005C00E000"
>

Well this option is not a GRUB command at all and has nothing to do
with similarly named GRUB facility that can be used to achieve the
same result.

This is a linux option that you need to add to the end of linux line
>
> But on bootable live flashdrive in boot/grub/grub.cfg im not sure how i am supposed to add it.
>
> do you know?
> thanks
>
>
> On Sun, Nov 6, 2022 at 6:09 PM Vladimir 'phcoder' Serbinenko <phcoder@gmail.com> wrote:
>>
>> Thank you a lot for this feedback. For LiveUSB: put original iso as a
>> file then install GRUB on the USB and put in boot/grub/grub.cfg:
>> memmap ...
>>
>> menuentry "My Live USB" {
>>   iso_path=<My ISO>
>>   export iso_path
>>   loopback loop $iso_path
>>   root=loop
>>   configfile /boog/grub/loopback.cfg
>> }
>>
>> The config is of the top of my head, might need some corrections. If
>> so please let me know and post them back for others
>>
>> On Sun, Nov 6, 2022 at 9:58 PM James Wabi <imitomx1978@gmail.com> wrote:
>> >
>> > Hi.
>> >
>> > Thanks you all developers that workd on Grub. With grub and the Badram and Memmap command i was able to fix my Laptop with bad/broken soldered ram memory in the motherboard.
>> > Actually "memmap" was the one that worked, which reserved specific memory address making the OS bootable and stable.
>> >
>> > The catch was to install linux on a good working PC and edit the cfg /etc/default/grub  to include some specific memmap lines for the memory addresses that needed to be blocked, then transfer the hard drive to the broken memory laptop. This fixed everything. and the laptop has been running perfectly.
>> >
>> > I have not found a way, and there is no information online, if this is possible to do with a LIVE linux USB flash drive. As soon as you boot from a live USB flashdrive, the machine starts to use bad broken soldered memory. And i wish there was a way to edit the live usb boot flash drive so it has edited GRUB memmap commands  in order to boot with the USB live linux and blocking that memory address.
>> >
>> > I have read i should prepare the live-usb flashdrive with rufus, but the files are completely different from what you do with a linux that is already installed on a hard drive  and changing /etc/default/grub cfg
>> >
>> > If this can be done in the future it would really help, to most of us that have bad soldered memory on the motherboard. Would be nice to live boot a linux and block some memory addresses.
>> >
>> > thanks!
>> >
>> >
>> > _______________________________________________
>> > Grub-devel mailing list
>> > Grub-devel@gnu.org
>> > https://lists.gnu.org/mailman/listinfo/grub-devel
>>
>>
>>
>> --
>> Regards
>> Vladimir 'phcoder' Serbinenko
>>
>> _______________________________________________
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>> https://lists.gnu.org/mailman/listinfo/grub-devel
>
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--
Regards
Vladimir 'phcoder' Serbinenko

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