i.MX ProcessorsのトピックRe: Minimum size of uimage on RAM https://community.nxp.com/t5/i-MX-Processors/Minimum-size-of-uimage-on-RAM/m-p/680970#M105181 <HTML><HEAD></HEAD><BODY><P>Hello Arif Shaikh,</P><P></P><P>There is not a definite answer to this, but this is a great answer given on another thread that has a very good approach.</P><P></P><P>"How much RAM is used by the kernel is a fuzzy subject as it is composed of various pieces. This is a more general Linux question not tied specifically to the NXP BSP. Having more RAM available allows Linux to cache better, avoiding slow, power-consuming flash reads and writes, etc. A dump of my /proc/meminfo (mem=256M) follows which has udevd, udhcpc, BusyBox syslogd &amp; klogd and one getty running — minimal indeed.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>The NXP i.MX 6UL EVK board has 512 MiB of DRAM. Measurements here translate 1:1 to the 6ULL. If I tell the kernel to use only 128 MiB on the kernel command line (mem=128M) the system boots to the login prompt, but one or more boot processes fail to allocate memory. I'd stick to at least 256 MiB for a small application."</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><PRE class=""><CODE>root@imx6ulevk:~# cat /proc/meminfo MemTotal:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 247464 kB MemFree:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 195596 kB MemAvailable:&nbsp;&nbsp;&nbsp;&nbsp; 197240 kB Buffers:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1440 kB Cached:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4784 kB SwapCached:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB Active:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5232 kB Inactive:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1920 kB Active(anon):&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 980 kB Inactive(anon):&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 148 kB Active(file):&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4252 kB Inactive(file):&nbsp;&nbsp;&nbsp;&nbsp; 1772 kB Unevictable:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB Mlocked:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB HighTotal:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB HighFree:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB LowTotal:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 247464 kB LowFree:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 195596 kB SwapTotal:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB SwapFree:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB Dirty:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB Writeback:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB AnonPages:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 948 kB Mapped:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3152 kB Shmem:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 200 kB Slab:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 7076 kB SReclaimable:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2196 kB SUnreclaim:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4880 kB KernelStack:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 400 kB PageTables:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 168 kB NFS_Unstable:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB Bounce:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB WritebackTmp:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB CommitLimit:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 123732 kB Committed_AS:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3924 kB VmallocTotal:&nbsp;&nbsp;&nbsp; 1810432 kB VmallocUsed:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 37908 kB VmallocChunk:&nbsp;&nbsp;&nbsp; 1596104 kB CmaTotal:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB CmaFree:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB<SPAN class=""></SPAN></CODE></PRE><P></P><P>I hope this helps!</P><P></P><P>Regards,</P></BODY></HTML> Mon, 03 Jul 2017 22:20:13 GMT gusarambula 2017-07-03T22:20:13Z Minimum size of uimage on RAM https://community.nxp.com/t5/i-MX-Processors/Minimum-size-of-uimage-on-RAM/m-p/680969#M105180 <HTML><HEAD></HEAD><BODY><P>Hi ,</P><P>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I am planning to use imx6ull. I want to know how much minimum RAM is required for bare minimum linux kernel for&nbsp; imx6ULL system. Thanks .</P></BODY></HTML> Mon, 03 Jul 2017 12:00:49 GMT https://community.nxp.com/t5/i-MX-Processors/Minimum-size-of-uimage-on-RAM/m-p/680969#M105180 arifsh10 2017-07-03T12:00:49Z Re: Minimum size of uimage on RAM https://community.nxp.com/t5/i-MX-Processors/Minimum-size-of-uimage-on-RAM/m-p/680970#M105181 <HTML><HEAD></HEAD><BODY><P>Hello Arif Shaikh,</P><P></P><P>There is not a definite answer to this, but this is a great answer given on another thread that has a very good approach.</P><P></P><P>"How much RAM is used by the kernel is a fuzzy subject as it is composed of various pieces. This is a more general Linux question not tied specifically to the NXP BSP. Having more RAM available allows Linux to cache better, avoiding slow, power-consuming flash reads and writes, etc. A dump of my /proc/meminfo (mem=256M) follows which has udevd, udhcpc, BusyBox syslogd &amp; klogd and one getty running — minimal indeed.</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><P>The NXP i.MX 6UL EVK board has 512 MiB of DRAM. Measurements here translate 1:1 to the 6ULL. If I tell the kernel to use only 128 MiB on the kernel command line (mem=128M) the system boots to the login prompt, but one or more boot processes fail to allocate memory. I'd stick to at least 256 MiB for a small application."</P><P style="min-height: 8pt; padding: 0px;">&nbsp;</P><PRE class=""><CODE>root@imx6ulevk:~# cat /proc/meminfo MemTotal:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 247464 kB MemFree:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 195596 kB MemAvailable:&nbsp;&nbsp;&nbsp;&nbsp; 197240 kB Buffers:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1440 kB Cached:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4784 kB SwapCached:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB Active:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 5232 kB Inactive:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1920 kB Active(anon):&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 980 kB Inactive(anon):&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 148 kB Active(file):&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4252 kB Inactive(file):&nbsp;&nbsp;&nbsp;&nbsp; 1772 kB Unevictable:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB Mlocked:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB HighTotal:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB HighFree:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB LowTotal:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 247464 kB LowFree:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 195596 kB SwapTotal:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB SwapFree:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB Dirty:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB Writeback:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB AnonPages:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 948 kB Mapped:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3152 kB Shmem:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 200 kB Slab:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 7076 kB SReclaimable:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2196 kB SUnreclaim:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4880 kB KernelStack:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 400 kB PageTables:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 168 kB NFS_Unstable:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB Bounce:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB WritebackTmp:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB CommitLimit:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 123732 kB Committed_AS:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3924 kB VmallocTotal:&nbsp;&nbsp;&nbsp; 1810432 kB VmallocUsed:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 37908 kB VmallocChunk:&nbsp;&nbsp;&nbsp; 1596104 kB CmaTotal:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB CmaFree:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0 kB<SPAN class=""></SPAN></CODE></PRE><P></P><P>I hope this helps!</P><P></P><P>Regards,</P></BODY></HTML> Mon, 03 Jul 2017 22:20:13 GMT https://community.nxp.com/t5/i-MX-Processors/Minimum-size-of-uimage-on-RAM/m-p/680970#M105181 gusarambula 2017-07-03T22:20:13Z