Dear Steve Strobel,
In message CAGrmWbyvjXRfCP2V-KNYNndt+UTSaQVrGELqXRNVEz+ySYT70w@mail.gmail.com you wrote:
Thanks for the reply. Host mode is all I need, so that is OK. But I think I must still be missing something. I grepped the entire U-Boot tree searching for CONFIG_ISP1362_USB, CONFIG_SYS_ISP and CONFIG_SYS_.R5_ISP and found only the definitions I quoted earlier;
CONFIG_ISP1362_USB is an option used only in the respective board config files, used there to set up a mapping for the respective device memory; if enabled, we define CONFIG_SYS_BR5_ISP1362 and CONFIG_SYS_OR5_ISP1362 which are then used in the code to program the memory controller of the SoC used on these boards as needed; see "board/tqc/tqm8xx/tqm8xx.c"
they don't seem to be used anywhere. And there is no way it could work without using them as the ISP1362 sits on the data bus as a memory-mapped part and the driver would need to know where to find it.
Well, the memory controller does get programmed for a valid mapping, see "board/tqc/tqm8xx/tqm8xx.c".
Is there somewhere else I should look for the code that implements CONFIG_ISP1362_USB and utilizes the defined addresses? Thanks.
There is no "code that implements CONFIG_ISP1362_USB" - this really only makes sure the device is mapped at the right address. But you are right - I don't even see USB enabled in the NSCU board config file. eventually all that gets done is setting up the memory controller (for later use in Linux?).
Sorry, I don't have access to NSCU boards any longer; I cannot verify that this actually works on this hardware.
Best regards,
Wolfgang Denk