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I've done it example project is USBFS Bootloader for PSoC® 3 and PSoC 5(EP64299) in PSoC5. Also I worked to size up bootloader code. However, it doesn't work after making size up source.
For example I enlarged the bootloader flash size to 74640 of 26144 bytes. In other words, flash sizes are gonna be larger than 64kb. Then I wrote bootloadable code to flash memory via USB but it doesn't work. I don't know why.
As a matter of course, I thought it shouldn’t cause any trouble. However, as I mentioned before, it did not branch & exchange[BX] address to flash size larger than 64KB. It was happened the only USBFS Bootloader, as it turned out. Because it’s OK to I2C Bootloader project. 😃