Hi,
I tried to build kernel 5.15 for iMX7D to boot from qspi flash Micron M25Q4096 without success. It always freeze at boot.
device 0 offset 0x6c40000, size 0x100000
SF: 1048576 bytes @ 0x6c40000 Read: OK
hab fuse not enabled
## Starting auxiliary core at 0x8FD00000 ...
device 0 offset 0x3720000, size 0x800000
SF: 8388608 bytes @ 0x3720000 Read: OK
device 0 offset 0x6b20000, size 0x20000
SF: 131072 bytes @ 0x6b20000 Read: OK
device 0 offset 0x3f20000, size 0xc00000
SF: 12582912 bytes @ 0x3f20000 Read: OK
Kernel image @ 0x80800000 [ 0x000000 - 0x704bc0 ]
## Flattened Device Tree blob at 83000000
Booting using the fdt blob at 0x83000000
hab fuse not enabled
Using Device Tree in place at 83000000, end 8300c29e
Starting kernel ...
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I managed to build it and boot fine using kernel 4.1 by adding specific configuration in
drivers/mtd/spi-nor/spi-nor.c:
{ "n25q4096", INFO(0x20ba22, 0, 64 * 1024, 4096, SPI_NOR_DDR_QUAD_READ) },
I see that now in kernel 5.x SPI_NOR_DDR_QUAD_READ is no longer present and using SPI_NOR_QUAD_READ is not fixing the issue.
Also is strange that in the imx dts files we still have ddr quad read property
spi-nor,ddr-quad-read-dummy = <6>;
but it looks like this property in never processed in kernel 5. In 4.1 it used to be parsed in drivers/mtd/spi-nor/fsl-quadspi.c
Does anybody faced this problem with ddr read issue? Is there any option in kernel 5 to enable ddr read for qspi flash?
Thank you!
vls
