Vivado Generate Bitstream (*.bin) with byte-swap

I want to flash the bitstream out of uboot, but I see that byte order in RAM is different:

zynq-uboot> md 0x2000000
02000020: bb000000 44002211 ffffffff ffffffff    .....".D........
02000030: 665599aa 00000020 01200230 00000000    ..Uf ...0. .....
…
zynq-uboot> md 0x2100000
02100020: 000000bb 11220044 ffffffff ffffffff    ....D.".........
02100030: aa995566 20000000 30022001 00000000    fU..... . .0....
…

So I get the bitstream via tftpboot and want to flash it, but I need a reverse byte order.

Is there any way to convert this, best during creation?

0 e14 Contributor over 10 years ago

The Vivado comand write_cfgmem can perform the byte swap required on the bitstream to use u-boot to load it . Take a look at the Application Note for Booting PicoZed from QSPI and eMMC, v3.0 under the PicoZed FMC V2 Reference designs on this site - there is a chapter near the end called "Moving the bitstream to eMMC". That section gives an example for using the write_cfgmem command.
Ron
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0 starbright over 10 years ago in reply to e14 Contributor

Your answer give me hope, but unfortunately it doesn't help. The recommended command just creates the same bin file out of a bit file.
I played with options for interface, but this doesn't give the byteswap I need. My suspicion is, that all this works reading bin file from mmc, but I get it via (linux) ftfp into memory.
I also don't know a way to modify this in uboot.
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