Kernel hangs while PCIe DBI access

[mallannanarsana]

On our custom i.MX6Q based board, Kernel hangs  while accessing the PCIe DBI registers (i,e readl(dbi_base)). please let us know possible reason for kernel hang.

Btw,
1. In u-boot , no problem while accessing DBI registers and also PCIe link comes up without any problem.

2. We are using official freescale kernel (4.1.15 ->imx_4.1.15_1.0.0_ga).

Thanks in advance

Mallanna

[mallannanarsana]

From i.MX6sx PCIe failes LTSSM training  "If PCIe is enabled in uboot, try to disable PCIe support in uboot.".

disabled PCIe support in u-boot and and link came up in kernel.

[igorpadykov · Accepted solution]

Hi Mallanna

thank for sharing this, also there is useful pcie usage explanation in uboot/../mx6sabresd.h

uboot-imx.git - Freescale i.MX u-boot Tree 

Best regards
igor
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