Joonyoung Shim wrote: > > On 7/7/2010 8:27 AM, Kukjin Kim wrote: > > Russell King wrote: > > Hi Russell :-) > > > >> On Tue, Jul 06, 2010 at 01:36:47PM +0900, Kukjin Kim wrote: > >>> This patch fixes on SECTION_SIZE_BITS for Sparsemem on > S5PV210/S5PC110. > >>> Because smallest size of a bank on S5PV210/S5PC110 is aligned by 16MB. > >>> So each section's maximum size should be 16MB. > >> What is the spacing of chunks of memory, and minimum alignment of those > >> chunks in physical address space? > > > > Some S5PC110(MCP D-type) has only available 80MiB in a bank. > > So the space accounts for 432MiB in a DMC0, but larger memory(256MiB + > > 128MiB) exists in a DMC1. > > > > As you know, the size of a section should be a power of 2 and a physical > > address space of a section should be contiguous. > > If a section size is greater than 16MiB, a section have a hole. So the > > SECTION_SIZE_BITS should be 16MiB. > > > >> Also, what is the maximum physical address which memory can be located? > > > > Following is memory map of S5PV210/S5PC110. > > > > 0x80000000 ------------------- > > | | > > 0x70000000 | | > > | | > > 0x60000000 | DMC 1 | up to 1GiB > > | | > > 0x50000000 | | > > | | > > 0x40000000 ----------------- > > | | > > 0x30000000 | DMC 0 | up to 512MiB > > | | > > 0x20000000 ------------------- > > > > Please see arch/arm/include/asm/sparsemem.h > > * SECTION_SIZE_BITS: The number of physical address bits to cover > * the maximum amount of memory in a section. > > I know 1 bank of S5PV210/S5PC110 have maximum 256MB, so i think > SECTION_SIZE_BITS is 28. Actually, the concept of section is different from bank. Thanks. Best regards, Kgene. -- Kukjin Kim <kgene.kim@xxxxxxxxxxx>, Senior Engineer, SW Solution Development Team, Samsung Electronics Co., Ltd. -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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