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hi everyone, i am doing a project in mpeg2 aac decoder and i want to finally port it to a c6201 processor.at present i am using ccs to port and optimise. at present i am stuck at writing the linker commmand file and am not able to move the data into data memory. can you please help me out by giving me the exact location of program, data and external memory for either map 0 or map 1 type. and if any special format of writing the linker command file? at present i have used program memory beginning as 0x01400000 and size 64k , data 0x80000000 size 64k and ext mem 0x00000000 size 16mb. i hope these figures r right but i keep getting an error :accesssing a reserved mem location. please reply as soon as possible. swami. |
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c6201 memory map
Started by ●August 6, 2004
Reply by ●August 7, 20042004-08-07
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> Date: Fri, 06 Aug 2004 05:16:54 -0000 > From: "swaminathanr2000" <> > > hi everyone, > i am doing a project in mpeg2 aac decoder and i want to finally port > it to a c6201 processor.at present i am using ccs to port and > optimise. > at present i am stuck at writing the linker commmand file and am not > able to move the data into data memory. C6000 has a very simple memory architecture. The memory system is a flat, byte addressable 4Gig (that is a 32 bit address) address range, split into smaller pieces to connect to different types of RAMs (SDRAM or SBSRAM), to address memory mapped registers (MMRs) and for internal (in the case of C6201 program and data) memory. No MMU or virtual addressing, so a 32 bit number defines a physical location. The memory might be either big- or little-endian and addresses of entities larger than the MAU (the minimal addressable unit or MADU -- the minimal addressable data unit) or byte in the case of C6000, have to be aligned on the corresponding address boundary, halfwords (two bytes long) should have the LSB zero, words (four bytes) should have two LSBs zeros and doublewords (eight bytes) should have three LSBs zeros. A C64xx has a set of non-aligned load/store instructions, but they aren't available on a C6201. A C620x/C6701 also have two maps, which usually are preset in hardware and by default (at least I think so!) map 1 is used. If your hardware allows, use map 1 instead of map 0 :) You might want to read chapters 3 (C6201/6701 internal memory) and 11 (boot modes) in the SPRU190D for complete information about memory and memory modes, or chapter 1 in SPRU577 and SPRU642 documents. There is also a set of MMRs that defines parameters of the external memory, but hopefully these are preset in your hardware, so you do not need to set them up manually, or write a gel subroutine or use CSL. > can you please help me out by giving me the exact location of > program, data and external memory for either map 0 or map 1 type. and See Boot modes (chpt 11 of SPRU190D or SPRU642). > if any special format of writing the linker command file? The most interesting part :) Fortunately the file is a plain ASCII file (as opposed to ADI ldfs, which are in an xml format -- stupid!). However, there are a few directives to describe memory ranges, memory input/output sections and memory/sections attributes. The linker commands are explained with examples in the SPRU186M, chapter 7. It might also be helpful to read Introduction to COFF (chapter 2 of SPRU186M) and SPRU186K chapter 5 Linking C/C++ code to find out what sections are created by the compiler/assembler. > at present i have used program memory beginning as 0x01400000 and > size 64k , data 0x80000000 size 64k and ext mem 0x00000000 size 16mb. > i hope these figures r right but i keep getting an error :accesssing > a reserved mem location. You might need to review you cmd (ldf) file and also check your program does not perform memory access outside available memory range. > please reply as soon as possible. > > swami. HTH, Andrew |
