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-rw-r--r-- | Documentation/memory.txt | 31 |
1 files changed, 2 insertions, 29 deletions
diff --git a/Documentation/memory.txt b/Documentation/memory.txt index 2b3dedd39538..802efe58647c 100644 --- a/Documentation/memory.txt +++ b/Documentation/memory.txt | |||
@@ -1,18 +1,7 @@ | |||
1 | There are several classic problems related to memory on Linux | 1 | There are several classic problems related to memory on Linux |
2 | systems. | 2 | systems. |
3 | 3 | ||
4 | 1) There are some buggy motherboards which cannot properly | 4 | 1) There are some motherboards that will not cache above |
5 | deal with the memory above 16MB. Consider exchanging | ||
6 | your motherboard. | ||
7 | |||
8 | 2) You cannot do DMA on the ISA bus to addresses above | ||
9 | 16M. Most device drivers under Linux allow the use | ||
10 | of bounce buffers which work around this problem. Drivers | ||
11 | that don't use bounce buffers will be unstable with | ||
12 | more than 16M installed. Drivers that use bounce buffers | ||
13 | will be OK, but may have slightly higher overhead. | ||
14 | |||
15 | 3) There are some motherboards that will not cache above | ||
16 | a certain quantity of memory. If you have one of these | 5 | a certain quantity of memory. If you have one of these |
17 | motherboards, your system will be SLOWER, not faster | 6 | motherboards, your system will be SLOWER, not faster |
18 | as you add more memory. Consider exchanging your | 7 | as you add more memory. Consider exchanging your |
@@ -24,7 +13,7 @@ It can also tell Linux to use less memory than is actually installed. | |||
24 | If you use "mem=" on a machine with PCI, consider using "memmap=" to avoid | 13 | If you use "mem=" on a machine with PCI, consider using "memmap=" to avoid |
25 | physical address space collisions. | 14 | physical address space collisions. |
26 | 15 | ||
27 | See the documentation of your boot loader (LILO, loadlin, etc.) about | 16 | See the documentation of your boot loader (LILO, grub, loadlin, etc.) about |
28 | how to pass options to the kernel. | 17 | how to pass options to the kernel. |
29 | 18 | ||
30 | There are other memory problems which Linux cannot deal with. Random | 19 | There are other memory problems which Linux cannot deal with. Random |
@@ -42,19 +31,3 @@ Try: | |||
42 | with the vendor. Consider testing it with memtest86 yourself. | 31 | with the vendor. Consider testing it with memtest86 yourself. |
43 | 32 | ||
44 | * Exchanging your CPU, cache, or motherboard for one that works. | 33 | * Exchanging your CPU, cache, or motherboard for one that works. |
45 | |||
46 | * Disabling the cache from the BIOS. | ||
47 | |||
48 | * Try passing the "mem=4M" option to the kernel to limit | ||
49 | Linux to using a very small amount of memory. Use "memmap="-option | ||
50 | together with "mem=" on systems with PCI to avoid physical address | ||
51 | space collisions. | ||
52 | |||
53 | |||
54 | Other tricks: | ||
55 | |||
56 | * Try passing the "no-387" option to the kernel to ignore | ||
57 | a buggy FPU. | ||
58 | |||
59 | * Try passing the "no-hlt" option to disable the potentially | ||
60 | buggy HLT instruction in your CPU. | ||