AM335x: Limit RAM size at kernel boot up by using 'mem' and increase after complete boot

Thirumalesha N

Hi All,

I'm working with Beagle bone black. I'm performing the following to do boot time reduction.

1) At boot up, i have passed memory size is 500MB using kernel parameter mem=500M. the kernel boots up fast. overall (including filesystem) boot up time its 21s

2) At boot up, i have passed memory size is 1GB using kernel parameter mem=1G. the kernel boots bit slow. overall (including filesystem) boot up time its 23s

I'm trying to understand what happening with these two cases.

My question is. At boot up i will mention RAM size is 'mem=500M' and after boot up, is there a way to increase RAM usage to 1GB ?

is this possible ? if so please suggest me

Regards,

Thiru N

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

Beaglebone Black has 512MB DDR3 memory, so I don't find much sense in what you are doing.

0 Thirumalesha N over 9 years ago in reply to Biser Gatchev-XID

Prodigy 30 points

Thanks for your response, sorry for inconvenience my target is beagle bone black based custom board. which as 1GB RAM

Please suggest me is there any way i can do it.

0 Biser Gatchev-XID over 9 years ago in reply to Thirumalesha N

TI__Guru**** 393215 points

The correct way to proceed is to specify and configure software for the correct memory size you have on board. There are other ways to reduce boot time, check this link: processors.wiki.ti.com/.../Sitara_Linux_Training:_Boot_Time_Reduction

0 Thirumalesha N over 9 years ago in reply to Biser Gatchev-XID

Prodigy 30 points

Hi Biser,

Thanks for your prompt response.

Is it possible to increase RAM size of usage after kernel boots ?

Regards,

Thiru N

0 Biser Gatchev-XID over 9 years ago in reply to Thirumalesha N

TI__Guru**** 393215 points

This is not a normal use case and I cannot say.

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AM335x: Limit RAM size at kernel boot up by using 'mem' and increase after complete boot