How do I create a bitmask to delimit the corrupted areas of the ram using the badram option of grub

user166241

1/14/23, 5:40 AM

I have a macbook air that has the ram memory soldered and the memory ranges corrupted starting from 0x784C1B10 (1924MB) (cpu in pararell mode, in a single cpu#0 or #2 the low memory error change to start from 0x10060AC50 (4102MB) and up to 0x1605F7518 (5637MB) and the memtest also indicates a Bits in Error Mask 00FF00FF00000000, The intermediate errors are approximate since memtest freezes when it reaches the errors and through trial and error I have come close to analyzing these areas of memory, I need the mask to enter the grub, applying an XNOR 0x50066240, 0x61000000 result on 0xfBf966240 it is this the mask?

GRUB_BADRAM="0x50066240,0xfBf966240" [![memtest report][1]][1] bits in errors shown by the memtest report image indicate 48 to 55 and 32 to 39

0000 0000 1111 1111 0000 0000 1111 1111 0000 0000 0000 0000 0000 0000 0000 0000 If change to Hex (same number as memtest results in bits in errors): FF 00 FF 00 00 00 00 invert 0 to 1 with NOT: 1111111100000000111111110000000011111111111111111111111111111111 FF 00 FF 00 FF FF FF FF thats look more as the mask, but is a number longer than the adress range... I do not understand. [1]: https://i.stack.imgur.com/qwTnj.png

0 + 0

boot

grub2

ram

David

1/14/23, 7:00 AM

You have defective hardware what are you trying to do?

user166241

1/14/23, 4:57 PM

blacklist the faulty ram memmory with grub.

ChanganAuto

1/15/23, 2:58 AM

Grub has absolutely nothing to do with it. Grub is a bootloader, that's all.

user166241

1/16/23, 7:48 PM

"Filter out bad RAM. This command notifies the memory manager that specified regions of RAM ought to be filtered out (usually, because they’re damaged). This remains in effect after a payload kernel has been loaded by GRUB," https://www.gnu.org/software/grub/manual/grub/html_node/badram.html

user166241

1/16/23, 8:15 PM

You even can tested in your computer with out faulty RAM i am doing that to find the correct mask, I am testing GRUB_BADRAM="0x10060AC50,0xff0f0ff" and after boot if you check the black list with: sudo grep RAM /proc/iomem When I compare with out it I get more System RAM Used but is not just on top of the adress 0x10060AC50 even in lower memory is asigned: > 00067000-0009ffff : System RAM ... > 10067000-20065fff : System RAM > 100067000-110065fff : System RAM > 110067000-120065fff : System RAM ... > 250067000-260065fff : System RAM > 260067000-26effffff : System RAM

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: How do I create a bitmask to delimit the corrupted areas of the ram using the badram option of grub

TH: ฉันจะสร้างบิตมาสก์เพื่อกำหนดพื้นที่ที่เสียหายของ ram โดยใช้ตัวเลือก badram ของ grub ได้อย่างไร

RO: Cum creez o mască de bit pentru a delimita zonele corupte ale ram folosind opțiunea badram a grub

RU: Как создать битовую маску для разграничения поврежденных областей оперативной памяти, используя параметр badram для grub

VI: Làm cách nào để tạo bitmask để phân định các vùng bị hỏng của ram bằng tùy chọn badram của grub

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