jtagspi cmd 0 1 0x05 ;# read status register
jtagspi cmd 0 0 0x06 ;# write enable
jtagspi cmd 0 1 0x05 ;# read status register again to check WEL
jtagspi cmd 0 0 0x01 0x40 ;# set QE bit (assuming BP to remain cleared)
Note that QE is a non-volatile bit, so it has to be set only once. From the
datasheet it is NOT quite clear to me how QE bit and QIOEN/QIODI commands do
interact. It is possible that setting QE instantly turns on QPI mode, so be
prepared that after the seqence above the flash will only accept QPI commands
*permanently*. So if you don't have a bitstream to set the FPGA to QPI mode,
too, you're lost.
---
**[tickets:#422] Modify the FPGA flash status register**
**Status:** new
**Milestone:** 0.11.0
**Created:** Sun Feb 04, 2024 03:05 AM UTC by KooLee
**Last Updated:** Sun Feb 04, 2024 09:07 AM UTC
**Owner:** nobody
I successfully updated the xilinx xc7a35t firmware using FT2232 and openocd.
my configuration
~~~
interface ftdi
ftdi_vid_pid 0x0403 0x6011
ftdi_channel 0
ftdi_layout_init 0x0098 0x008b
reset_config none
source [find cpld/xilinx-xc7.cfg]
source [find cpld/jtagspi.cfg]
adapter_khz 10000
proc fpga_program {} {
global _CHIPNAME
xc7_program $_CHIPNAME.tap
}
init
jtagspi_init 0 bscan_spi_xc7a35t.bit
jtagspi_program fw.bin 0x0
fpga_program
shutdown
~~~
I have a question, is it possible to modify the status register of the Flash
chip on the FPAG board via openocd.
I want to turn on Quad Enable by modifying the status register of the Flash
chip on the FPGA board via openocd.
I checked the "12 Flash Commands" document and it seems that there is no
command support.
Is there any way I can realize this idea, thanks.
---
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