RAM size vs CPU (failed to come online)

[vinothkumars]

Hi All,

I want to know how RAM size will effect the CPU1 to CPUn come to online or not,

for example,

SDRAM1 size - 2GB

SDRAM2 size - 4GB

[ 0.096798] CPU identified as i.MX8QM, silicon rev 1.1
[ 0.101693] EFI services will not be available.
[ 0.114138] smp: Bringing up secondary CPUs ...
[ 1.151137] CPU1: failed to come online
[ 1.154630] CPU1: failed in unknown state : 0x0
[ 2.211948] CPU2: failed to come online
[ 2.215435] CPU2: failed in unknown state : 0x0
[ 3.272757] CPU3: failed to come online
[ 3.276246] CPU3: failed in unknown state : 0x0
[ 4.333564] CPU4: failed to come online
[ 4.337053] CPU4: failed in unknown state : 0x0
[ 5.394374] CPU5: failed to come online
[ 5.397864] CPU5: failed in unknown state : 0x0
[ 5.402438] smp: Brought up 1 node, 1 CPU
[ 5.406378] SMP: Total of 1 processors activated.

SDRAM1 size - 2GB

SDRAM2 size - 1GB

[ 0.096006] CPU identified as i.MX8QM, silicon rev 1.1
[ 0.100900] EFI services will not be available.
[ 0.113343] smp: Bringing up secondary CPUs ...
[ 0.146857] Detected VIPT I-cache on CPU1
[ 0.146886] GICv3: CPU1: found redistributor 1 region 0:0x0000000051b20000
[ 0.146920] CPU1: Booted secondary processor [410fd034]
[ 0.174846] CPU0: Unknown IPI message 0xf
[ 0.174848] CPU1: Unknown IPI message 0xf
[ 0.174864] Detected VIPT I-cache on CPU2
[ 0.178520] GICv3: CPU2: found redistributor 2 region 0:0x0000000051b40000
[ 0.178536] CPU2: Booted secondary processor [410fd034]
[ 0.207774] Detected VIPT I-cache on CPU3
[ 0.207788] GICv3: CPU3: found redistributor 3 region 0:0x0000000051b60000
[ 0.207805] CPU3: Booted secondary processor [410fd034]
[ 0.237416] Detected PIPT I-cache on CPU4
[ 0.237433] GICv3: CPU4: found redistributor 100 region 0:0x0000000051b80000
[ 0.237451] CPU4: Booted secondary processor [410fd082]
[ 0.263854] Detected PIPT I-cache on CPU5
[ 0.263865] GICv3: CPU5: found redistributor 101 region 0:0x0000000051ba0000
[ 0.263877] CPU5: Booted secondary processor [410fd082]
[ 0.263934] smp: Brought up 1 node, 6 CPUs
[ 0.352402] SMP: Total of 6 processors activated.

[igorpadykov]

Hi Vinothkumar

may be recommended to debug it enabling scfw debug monitor and use

sect.4.6 Hardware Resource/Memory Isolation System Controller Firmware API Reference Guide
included in  SCFW Porting Kit​ 1.8.0

Best regards
igor

[vinothkumars]

Thank you for the reply