From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ho Shui Choy Stanley PS03B NCS To: "'Lewin A.R.W. Edwards'" Cc: "Ecos-Discuss (E-mail)" Subject: RE: [ECOS] Use of internal and external ram Date: Mon, 23 Apr 2001 19:30:00 -0000 Message-id: <19C34CD863B1D4118E2800508BAF663A0112F616@STONE> X-SW-Source: 2001-04/msg00341.html I'm using the sources provided by Carl van Shauik. I am developing the port independently and has managed to build and tested using the examples programs from eCos successfully. As for the usage of RAM, is it as simple as adding a section name to those areas which are to be located in another section in the vectors.S files then add that section in the memory layout using the eCos configuration tool? You mentioned about the linker script, are you referring to arm.ld in this case? If so what should I do to this file? Thanks Stanley -----Original Message----- From: Lewin A.R.W. Edwards [ mailto:larwe@larwe.com ] Sent: Monday, April 23, 2001 23:19 To: Ho Shui Choy Stanley PS03B NCS; Ecos-Discuss (E-mail) Subject: Re: [ECOS] Use of internal and external ram Hi Stanley, >I am building eCos for AT91EB40 Question: Where did you get the sources for this? Is this the old archived port mentioned on ecos-discuss some weeks ago, or are you collaborating with Daniel Andersson, or are you developing an independent port? >In my platform there is internal ram(addr 0x00100000) and external ram(addr >0x02000000) how do I make use of both available ram? >Is it possible to specify that the stack space resides in the internal ram >while data in external ram? It's certainly possible (I do something very similar on the EP7212 - user, FIQ, IRQ, SVC stacks are in on-chip SRAM and heap is in off-chip DRAM). It's just a matter of tinkering with the startup code and linker script. For elegant integration into eCos, especially given that most people who use it are going to port it to "real" hardware sometime, I would suggest that you expose this stuff to configtool if possible. === Lewin A.R.W. Edwards (Embedded Engineer) Work: http://www.digi-frame.com/ Personal: http://www.zws.com/ and http://www.larwe.com/ "... a man who is endowed with real qualities of leadership will be tempted to refrain from taking part in political life; because [...] the situation does not call for a man who has a capacity for constructive statesmanship but rather for a man who is capable of bargaining for the favour of the majority. Thus the situation will appeal to small minds and will attract them accordingly."