mhada
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Hi, Actually I did not know regarding SPI Flash configuration of xilinx earlier and so I was confused. But now I know and I have used it and so things are clear. Thanks for the reply. Regards.
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When I say configured means, what is the method of flashing at hardware level?
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Any one who could help in this?
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Thanks mjones. I would try eMMC lines directly as GPMC and drive a custom NOR CAPE. May be once i get through I will close this thread as answered. Thanks for all the help.
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Hi mjones, You can consider me very naive in this area but doing what you suggest gives we shocks as I perceive it in this way:- 1) Booting from GPMC NOR Flash 2) Switching to eMMC and resetting it 3) Again going to GPMC mode as my application cod…
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Just check this line:- BEFORE the SW reinitializes the pins, it MUST put the eMMC in reset. This is done by taking eMMC_RSTn (GPIO1_20) LOW after the eMMC has been put into a mode to enable the reset line. eMMC during power on is not in a mode t…
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Hi Jonathan, I tried to use eMMC lines going from uC as GPIO and toggled them. I found that everythng was fine. Except that when I toggled MMC1_CLK or MMC1_CMD, I found that MMC1_DAT0 started toggling between 3.3V and 2.5V and it also remained to 2…
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These lines of SRM of BBB of scetion 8.1.2 bother me:- BEFORE the SW reinitializes the pins, it MUST put the eMMC in reset. This is done by taking eMMC_RSTn (GPIO1_20) LOW after the eMMC has been put into a mode to enable the reset line. This pin d…
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Right... The place where I am still doubtful is that if I try and boot BBB with my NOR Flash using GPMC controller, can it still conflict with eMMC functionally or electrically? Whether resetting eMMC is a must when using the shared lines as GPMC bu…
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Can erasing eMMC help me Johnathan?
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SPI is fine for loading to FPGA. I do not want GPMC to load on FPGA but I want to boot my device using GPMC for a custom hardware that I want to design..
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Hi johnathan, The custom hardware that I want to design requires to boot from a NOR Flash using GPMC interface which will also hold the config files for a xilinx FPGA. Now to emulate this exercise I have chosen BBB, Logi Bone V2 and a custom NOR C…
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Any of the friends here who could reply on it....
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Yes, this is what I wanted to make sure as to whether if still FPGA side had some issues. Again Jonathan, just to continue, what if I want to boot BBB using GPMC interface with a third card which has a NOR Flash and that NOR Flash holds the configu…
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Hi jonathan, please reply as ou find time or tell me in case you find my question confusing...
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The reason I ask this:- Again can i pull down CFG_FLSH_RST permanently so that FLASH is bypassed here? Is that I do not know as to what will happen between FLASH and FPGA in the time when I will be configuring the I2C Expander through BBB. Will t…
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Hi jonathan, In your previous post you have said regarding mux_oen pin. I do not find any such pin on the expander of I2C to GPIO. Which one is that you mean here? Again can i pull down CFG_FLSH_RST permanently so that FLASH is bypassed here? Reg…
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Hi Jpiat, How are you? What if I keep the BOOT switch on permanently on the BBB so that I can boot my uC through JTAG directly and configure the FPGA on LB-2. In that case do I need to worry regarding the eMMC lines conflict with LB-2. Please tell…
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Thanks a lot Jonathon, very kind of you...
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Hi, Thanks. Will come again once thought over it a little more...
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Thanks a lot...
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Hi Jonathan, One more query in this thread for your kind attention:- If I do not boot from BBB eMMC and do this programming using starterware through JTAG interface:- Then will setting the SPI1 interface for transfer of data and I2C1 interface for…
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I think I am confusing my question on INIT. I think you are telling input w.r.t to Expander IC I/O Port / uC port. But I am telling w.r.t. to the FPGA given in conceptual explanation given in UG380.pdf of Xilinx Slave Serial Configuration. There it …
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Hi Jonathan, Thanks for the response. Can you tell me as to what do you mean by mode 1. I think the mode should be set to 3 for slave serial isn't it? Again another confusion, I have as to INIT is first described as input and then as output bu th…
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Hi Jpiat, Thanks for the reply. I am clear regarding the hardware but how to go about the program written in logi-tools is not very clear to me as I am not used to of linux but I can try [A brief document regarding the flow of the code would have b…