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Altera_Forum's avatar
Altera_Forum
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20 years ago

uClinux without Flash (again)

I decided to give uClinux a try on my custom board, but I only have an SD card slot, no CFI. When reading the install guide for uClinux, and when trying it, it won't let me build a kernel project...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

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I take it you are using true MMC mode instead of SPI, which is why you are using PIO? That should be really cool once it is done; I am actually moving away from MMC/SD now to CF just because of lack of driver support sad.gif Is the driver included in the kernel any good, or does that not even work?[/b]

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The mmc interface level drivers included with the kernel are for intel XA and arm, though higher mmc

level driver are common. We still need a low level MMC interface driver for NIOS2. The SPI driver in the kernel tree did not serve this. I had worked on both MMC/SD protocol and SPI protocol using PIO ports for embeded systems in the past. I am trying to port the drivers to uclinux. We always have limited LE resources on a FPGA, and doing it in software can save some space in hardware. Hardware should be used for speed-critical purpose.