[U-Boot] [PATCH] mmc: seperate block number into small parts for multi-write cmd

[Reinhard Meyer]

Dear Lei Wen,
> As mmc host limitation, the max number of block in one go
> should be limited to 65535, and the max buffer size should
> not excceed 512k bytes.

Where does this limitation supposedly come from?

And, 65535 blocks (of 512) are already near 32 MB.

TOP9000> mmci
mci: setting clock 194000 Hz, block size 512
mci: setting clock 24832000 Hz, block size 512
mci: setting clock 194000 Hz, block size 512
mci: setting clock 194000 Hz, block size 512
mci: setting clock 24832000 Hz, block size 512
Device: mci
Manufacturer ID: 3
OEM: 5344
Name: SD32G
Tran Speed: 25000000
Rd Block Len: 512
SD version 2.0
High Capacity: Yes
Capacity: 31914983424
Bus Width: 4-bit
TOP9000> mmc write 0 20000000 1000 18000

MMC write: dev # 0, block # 4096, count 98304 ... mci: setting clock 194000 Hz,
block size 512
mci: setting clock 24832000 Hz, block size 512
mci: setting clock 194000 Hz, block size 512
mci: setting clock 194000 Hz, block size 512
mci: setting clock 24832000 Hz, block size 512
98304 blocks written: OK
TOP9000>

Reinhard