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en:pcie:disable-fatal [2019/04/17 04:16] alex created |
en:pcie:disable-fatal [2019/04/17 04:21] alex |
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| </code> | </code> | ||
| - | To work around this crash, PCIe fatal error reporting must be disabled on the switch or root port upstream of the FPGA. Specifically, two bits must be cleared - SERR in the command register, and the fatal error reporting enable bit in the device control register in the PCIe capability. The following script performs these operations on the switch port upstream of the specified PCIe device ID. | + | The device falling off the bus triggers a PCIe fatal error that causes the kernel to panic and the iDRAC to reboot the machine. The iDRAC is totally independent from the operating system; it will still reboot the machine even if the operating system ignores the error. |
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| + | To work around this crash, the error must not be reported to the OS or to the iDRAC. To that end, PCIe fatal error reporting must be disabled on the switch or root port upstream of the FPGA. Specifically, two bits must be cleared - SERR in the command register, and the fatal error reporting enable bit in the device control register in the PCIe capability. The following script performs these operations on the switch port upstream of the specified PCIe device ID. | ||
| <code sh> | <code sh> | ||
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| echo "Device control:" $ctrl | echo "Device control:" $ctrl | ||
| - | # clear non-fatal error reporting enable bit in device control register | + | # clear fatal error reporting enable bit in device control register |
| setpci -s $port CAP_EXP+8.w=$(printf "%04x" $(("0x$ctrl" & ~0x0004))) | setpci -s $port CAP_EXP+8.w=$(printf "%04x" $(("0x$ctrl" & ~0x0004))) | ||