> > > Dear chang-ming.hu...@freescale.com, > > > > > > > From: Jerry Huang <chang-ming.hu...@freescale.com> > > > > > > > > For the current u-boot codes, only 4bit/1bit SD/SDHC bus width is > > > > > > support. > > > > > > > So for MMC card, we also support 4bit bus width, otherwiase, we > > > > will > > > > > > > get the 12bit bus width, which is not correct: > > > Andy ... can you please explain? I don't quite understand the > > > problem, I thought we had no problem supporting 8bit mmc (esp. if > > > the controller handles that for us mostly). > > > > Yes, the controller support 8bit MMC. > > > > FSL ESDHC driver set the host_caps = MMC_MODE_4BIT | MMC_MODE_8BIT; > > But, the current codes for MMC card has been changed to: > > > > } else { > > width = ((mmc->host_caps & MMC_MODE_MASK_WIDTH_BITS) >> > > MMC_MODE_WIDTH_BITS_SHIFT); > > for (; width >= 0; width--) { > > .... > > > > So for FSL ESDHC, the width = 3, after implement mmc_switch > > successfully, will set the bus to 4 * width. Therefore, I will get the > > 12bit (4 x 3) bus width. > > > > Below is the old codes (width = 2): > > } else { > > for (width = EXT_CSD_BUS_WIDTH_8; width >= 0; width--) > > { > [...] > > > Uh, so it's a bug in the MMC subsystem? > Best regards,
I don't know. Maybe Andy can give some comment. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot