Re: [PATCH] MIPS: fix pfn_valid() for FLAGMEM

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hello, I wrote:

Are the non-memory parts marked as reserved?

No, so, is that a need to mark them?

Initially all pages are marked as reserved.

Which seems to be good enough for x86:

$ cat /proc/iomem
00000000-0009efff : System RAM
0009f000-0009ffff : reserved
000c0000-000cffff : pnp 00:0d
000e0000-000fffff : pnp 00:0d
00100000-7fe5b7ff : System RAM
[...]

The 0x9f000 - 0x9ffff range is the good old ISA I/O memory range (classic
MDA/CGA/VGA etc.), that is non-memory yet:


Not really, it's a usual RAM. CGA/VGA video memory occupies

   Oh, I meant EGA/VGA. CGA memory is at 000b8000-000bffff, of course.

000a0000-000bffff and MDA occupies 000b0000-000b7ffff (if not less).
This range is probably reserved by BIOS for something like EBDA...

   Which stands for Extended BIOS Data Area.

WBR, Sergei


[Index of Archives]     [Linux MIPS Home]     [LKML Archive]     [Linux ARM Kernel]     [Linux ARM]     [Linux]     [Git]     [Yosemite News]     [Linux SCSI]     [Linux Hams]

  Powered by Linux