diff options
| -rw-r--r-- | share/man/man4/man4.arm/devcfg.4 | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/share/man/man4/man4.arm/devcfg.4 b/share/man/man4/man4.arm/devcfg.4 index 5068fa4..392e77d 100644 --- a/share/man/man4/man4.arm/devcfg.4 +++ b/share/man/man4/man4.arm/devcfg.4 @@ -39,19 +39,20 @@ can be used to configure the PL (FPGA) section of the Xilinx Zynq-7000. .Pp On the first write to the character device at file offset 0, the devcfg driver asserts the top-level PL reset signals, disables the PS-PL level shifters, -and clears the PL configuration. Write data is sent to -the PCAP (processor configuration access port). When the PL asserts the -DONE signal, the devcfg driver will enable the level shifters and release -the top-level PL reset signals. +and clears the PL configuration. +Write data is sent to the PCAP (processor configuration access port). +When the PL asserts the DONE signal, the devcfg driver will enable the level +shifters and release the top-level PL reset signals. .Pp -The PL (FPGA) can be configured by writing the bitstream to the -character device like this: +The PL (FPGA) can be configured by writing the bitstream to the character +device like this: .Bd -literal -offset indent cat design.bit.bin > /dev/devcfg .Ed .Pp The file should not be confused with the .bit file output by the FPGA -design tools. It is the binary form of the configuration bitstream. +design tools. +It is the binary form of the configuration bitstream. The Xilinx .Pa promgen tool can do the conversion: @@ -65,15 +66,17 @@ variables: .Bl -tag -width 12 .It Va hw.fpga.pl_done .Pp -This variable always reflects the status of the PL's DONE signal. A 1 -means the PL section has been properly programmed. +This variable always reflects the status of the PL's DONE signal. +A 1 means the PL section has been properly programmed. .It Va hw.fpga.en_level_shifters .Pp This variable controls if the PS-PL level shifters are enabled after the -PL section has been reconfigured. This variable is 1 by default but setting -it to 0 allows the PL section to be programmed with configurations that -don't interface to the PS section of the part. Changing this value has no -effect on the level shifters until the next device reconfiguration. +PL section has been reconfigured. +This variable is 1 by default but setting it to 0 allows the PL section to be +programmed with configurations that don't interface to the PS section of the +part. +Changing this value has no effect on the level shifters until the next device +reconfiguration. .Sh FILES /dev/devcfg Character device for .Nm |
