Hi Feng, I am writing UEFI driver for SD/MMC controller on my platform. Unfortunately, I have a problem with communication between card and controller.
I implement SdMmcPassThru protocol (mainly based on your implementation, only bigger changes in initialization sequence) and want to use your SD driver. My situation is as follow: I am trying to use PIO mode for data transfer. Commands are transfered between controller and SD card (e.g. CMD8, ACMD41, ACMD6, and so on), What's more responses are correct (e.g CSD register). Problems start when generic UEFI stack tries to read block of data from card. My driver sends CMD17 to card but when we check NORMAL_INTERRUPT_STATUS_REGISTER there is BIT15 set (what indicates error). ERROR_INTERRUPT_STATUS_REGISTER has set BIT6 (RD_DATA_END_BIT_ERROR) - do you know what may cause such error? Do you have any tips, what should I try to do? Does UEFI SD stack support PIO data transfer? Was it tested on any platform? And if DMA will be used, what about cache maintanance in your driver? If any additional information are neccesary, please ask. Best Regards, Jan _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
