ls1046a(32bit) can't start without PAE mode

[leimaohui]

Recently, I try to use kdump on ls1046a(32bit), but because of the CONFIG_PHYS_ADDR_T_64BIT has been enabled by CONFIG_PAE, kdump can't work normally.

So, I disabled CONFIG_PAE and try kdump again, but the 1st kernel can't start. It is blocked after output messages as following:

......

[ 0.321310] EDAC MC: Ver: 3.0.0
[ 0.324833] bman-fbpr addr 0xfa000000 size 0x1000000
[ 0.329849] Bman err interrupt handler present
[ 0.334637] Bman portal (shared) initialised, cpu 0
[ 0.339539] Bman portal (slave) initialised, cpu 1
[ 0.344357] Bman portal (slave) initialised, cpu 2
[ 0.349172] Bman portal (slave) initialised, cpu 3
[ 0.353986] Bman portals initialised
[ 0.358467] Qman err interrupt handler present
[ 0.363242] Qman portal (shared) initialised, cpu 0
[ 0.368148] Qman portal (slave) initialised, cpu 1
[ 0.372963] Qman portal (slave) initialised, cpu 2
[ 0.377777] Qman portal (slave) initialised, cpu 3
[ 0.382594] Qman portals initialised
[ 0.386230] Bman: BPID allocator includes range 32:32
[ 0.391333] Qman: FQID allocator includes range 256:256
[ 0.396588] Qman: FQID allocator includes range 32768:32768
[ 0.402219] Qman: CGRID allocator includes range 0:256

......

Is there any one give me some suggestions about how to disable PAE mode or how to use kdump on ls1046a?

[yipingwang]

Hello lei maohui,

I confirmed with the LSDK testing team, kexec/kdump is not support in ARMv8 32bit Kernel. I just verified the 32bit Kernel, and found that crashkernel memory couldn't be reserved successfully, please refer to the following boot information.

root@TinyDistro:~# dmesg | grep -i "crashkernel"

[    0.000000] crashkernel reservation failed - No suitable area found.

[    0.000000] Kernel command line: console=ttyS0,115200 root=/dev/ram0 earlycon=uart8250,mmio,0x21c0500 mtdparts=1550000.quadspi:1m(rcw),15m(u-boot),48m(kernel.itb);

7e800000.flash:16m(nand_uboot),48m(nand_kernel),448m(nand_free) crashkernel=512M

Please refer to the following information in 64bit mode Kernel.

root@TinyDistro:~# dmesg | grep -i "crashkernel"

[    0.000000] crashkernel reserved: 0x00000009e0000000 - 0x0000000a00000000 (512 MB)

[    0.000000] Kernel command line: console=ttyS0,115200 root=/dev/ram0 earlycon=uart8250,mmio,0x21c0500 mtdparts=1550000.quadspi:1m(rcw),15m(u-boot),48m(kernel.itb);7e800000.flash:16m(nand_uboot),48m(nand_kernel),448m(nand_free) crashkernel=512M

Have a great day,
TIC

-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------