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 Former Member over 9 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 9 years ago in reply to Former Member

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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