From: Maximilian Brune maximilian.brune@9elements.com
Currently fetching files bigger that cause a data transfer greater than U16_MAX fails.
The reason is that the specification defines the datalength register as a 16 bit wide register, but in u-boot it is used as if it is an 32 bit register. Therefore values greater than U16_MAX cause an infinite loop inside u-boot. U-boot expects to get more data from interface/hardware then it will ever get and therefore inifintely waits for more data that will never come.
Signed-off-by: Maximilian Brune maximilian.brune@9elements.com Cc: Peng Fan peng.fan@nxp.com Cc: Jaehoon Chung jh80.chung@samsung.com --- drivers/mmc/arm_pl180_mmci.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/drivers/mmc/arm_pl180_mmci.c b/drivers/mmc/arm_pl180_mmci.c index 5cf5502ed5..cad73ea106 100644 --- a/drivers/mmc/arm_pl180_mmci.c +++ b/drivers/mmc/arm_pl180_mmci.c @@ -231,6 +231,7 @@ static int do_data_transfer(struct mmc *dev, u32 blksz = 0; u32 data_ctrl = 0; u32 data_len = (u32) (data->blocks * data->blocksize); + assert(data_len < U16_MAX); /* should be ensured by arm_pl180_get_b_max */
if (!host->version2) { blksz = (ffs(data->blocksize) - 1); @@ -358,6 +359,14 @@ static int host_set_ios(struct mmc *dev) return 0; }
+static int arm_pl180_get_b_max(struct udevice *dev, void *dst, lbaint_t blkcnt) +{ + struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev); + struct mmc *mmc = upriv->mmc; + + return U16_MAX / mmc->read_bl_len; +} + #ifndef CONFIG_DM_MMC /* MMC uses open drain drivers in the enumeration phase */ static int mmc_host_reset(struct mmc *dev) @@ -373,6 +382,7 @@ static const struct mmc_ops arm_pl180_mmci_ops = { .send_cmd = host_request, .set_ios = host_set_ios, .init = mmc_host_reset, + .get_b_max = arm_pl180_get_b_max, };
/* @@ -531,6 +541,7 @@ static const struct dm_mmc_ops arm_pl180_dm_mmc_ops = { .send_cmd = dm_host_request, .set_ios = dm_host_set_ios, .get_cd = dm_mmc_getcd, + .get_b_max = arm_pl180_get_b_max, };
static int arm_pl180_mmc_of_to_plat(struct udevice *dev)