Dear Chang-Ming.Huang@freescale.com,
From: Jerry Huang Chang-Ming.Huang@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).
=> mmcinfo Device: FSL_SDHC Manufacturer ID: 1e OEM: ffff Name: MMC Tran Speed: 52000000 Rd Block Len: 512 MMC version 4.0 High Capacity: No Capacity: 1.9 GiB Bus Width: 12-bit
Signed-off-by: Jerry Huang Chang-Ming.Huang@freescalecom CC: Andy Fleming afleming@gmail.com CC: Marek Vasut marex@denx.de
drivers/mmc/fsl_esdhc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index 3f8d30d..7b83dd2 100644 --- a/drivers/mmc/fsl_esdhc.c +++ b/drivers/mmc/fsl_esdhc.c @@ -577,7 +577,7 @@ int fsl_esdhc_initialize(bd_t *bis, struct fsl_esdhc_cfg *cfg) return -1; }
- mmc->host_caps = MMC_MODE_4BIT | MMC_MODE_8BIT;
mmc->host_caps = MMC_MODE_4BIT;
if (caps & ESDHC_HOSTCAPBLT_HSS) mmc->host_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
Best regards, Marek Vasut