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@@ -0,0 +1,42 @@
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+diff --git a/package/boot/uboot-sunxi/patches/004-sunxi-mmc-set-transfer-timeout-according-to-byte_cnt.patch b/package/boot/uboot-sunxi/patches/004-sunxi-mmc-set-transfer-timeout-according-to-byte_cnt.patch
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+new file mode 100644
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+index 0000000..180b60b
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+--- /dev/null
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++++ b/package/boot/uboot-sunxi/patches/004-sunxi-mmc-set-transfer-timeout-according-to-byte_cnt.patch
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+@@ -0,0 +1,36 @@
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++From 8a5481e2e51a86e858c4f1481729421f26cc240c Mon Sep 17 00:00:00 2001
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++From: Yousong Zhou <[email protected]>
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++Date: Sat, 29 Aug 2015 21:26:11 +0800
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++Subject: [PATCH] sunxi: mmc: set transfer timeout according to byte_cnt.
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++
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++Originally a timeout value of 2 seconds was used regardless of the size
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++of data to be transfered. This prevented slow devices from working
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++correctly while there was no much gain for faster devices, e.g. it takes
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++3708ms for a transfer of uImage of size 1899008 bytes.
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++
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++Signed-off-by: Yousong Zhou <[email protected]>
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++---
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++ drivers/mmc/sunxi_mmc.c | 6 ++++--
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++ 1 file changed, 4 insertions(+), 2 deletions(-)
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++
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++diff --git a/drivers/mmc/sunxi_mmc.c b/drivers/mmc/sunxi_mmc.c
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++index e7ab828..7a990f7 100644
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++--- a/drivers/mmc/sunxi_mmc.c
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+++++ b/drivers/mmc/sunxi_mmc.c
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++@@ -257,9 +257,11 @@ static int mmc_trans_data_by_cpu(struct mmc *mmc, struct mmc_data *data)
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++ const uint32_t status_bit = reading ? SUNXI_MMC_STATUS_FIFO_EMPTY :
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++ SUNXI_MMC_STATUS_FIFO_FULL;
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++ unsigned i;
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++- unsigned byte_cnt = data->blocksize * data->blocks;
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++- unsigned timeout_msecs = 2000;
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++ unsigned *buff = (unsigned int *)(reading ? data->dest : data->src);
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+++ unsigned byte_cnt = data->blocksize * data->blocks;
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+++ unsigned timeout_msecs = byte_cnt >> 8;
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+++ if (timeout_msecs < 2000)
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+++ timeout_msecs = 2000;
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++
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++ /* Always read / write data through the CPU */
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++ setbits_le32(&mmchost->reg->gctrl, SUNXI_MMC_GCTRL_ACCESS_BY_AHB);
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++--
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++1.7.10.4
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++
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Zoltan Herpai