From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- Documentation/arm/Sharp-LH/SDRAM | 51 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 Documentation/arm/Sharp-LH/SDRAM (limited to 'Documentation/arm/Sharp-LH/SDRAM') diff --git a/Documentation/arm/Sharp-LH/SDRAM b/Documentation/arm/Sharp-LH/SDRAM new file mode 100644 index 00000000000..93ddc23c2fa --- /dev/null +++ b/Documentation/arm/Sharp-LH/SDRAM @@ -0,0 +1,51 @@ +README on the SDRAM Controller for the LH7a40X +============================================== + +The standard configuration for the SDRAM controller generates a sparse +memory array. The precise layout is determined by the SDRAM chips. A +default kernel configuration assembles the discontiguous memory +regions into separate memory nodes via the NUMA (Non-Uniform Memory +Architecture) facilities. In this default configuration, the kernel +is forgiving about the precise layout. As long as it is given an +accurate picture of available memory by the bootloader the kernel will +execute correctly. + +The SDRC supports a mode where some of the chip select lines are +swapped in order to make SDRAM look like a synchronous ROM. Setting +this bit means that the RAM will present as a contiguous array. Some +programmers prefer this to the discontiguous layout. Be aware that +may be a penalty for this feature where some some configurations of +memory are significantly reduced; i.e. 64MiB of RAM appears as only 32 +MiB. + +There are a couple of configuration options to override the default +behavior. When the SROMLL bit is set and memory appears as a +contiguous array, there is no reason to support NUMA. +CONFIG_LH7A40X_CONTIGMEM disables NUMA support. When physical memory +is discontiguous, the memory tables are organized such that there are +two banks per nodes with a small gap between them. This layout wastes +some kernel memory for page tables representing non-existent memory. +CONFIG_LH7A40X_ONE_BANK_PER_NODE optimizes the node tables such that +there are no gaps. These options control the low level organization +of the memory management tables in ways that may prevent the kernel +from booting or may cause the kernel to allocated excessively large +page tables. Be warned. Only change these options if you know what +you are doing. The default behavior is a reasonable compromise that +will suit all users. + +-- + +A typical 32MiB system with the default configuration options will +find physical memory managed as follows. + + node 0: 0xc0000000 4MiB + 0xc1000000 4MiB + node 1: 0xc4000000 4MiB + 0xc5000000 4MiB + node 2: 0xc8000000 4MiB + 0xc9000000 4MiB + node 3: 0xcc000000 4MiB + 0xcd000000 4MiB + +Setting CONFIG_LH7A40X_ONE_BANK_PER_NODE will put each bank into a +separate node. -- cgit v1.2.3