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warpme / miniarch

ArchLinux ARM SD card images for quick start with ArchLinux on ARM SBC & TV Boxes
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H313 , Only 2GB seen by system (solved: fake specs / fake "bios" reporting) #12

Closed mercs759 closed 1 year ago

mercs759 commented 1 year ago

Anwol Q86x (H313) has 8 ram chips (4 on side A and other 4 on side B of PCB ), every chip is marked "SEC XXX hyh9 k4b2g0446c" , where XXX changes They should be by Samsung.

according to Samsung datasheet "2Gb C-die DDR3L SDRAM, Ver.1.31 November 2010" (https://www.datasheets360.com/pdf/2129653661416128875 , page 5 and following)

they are DDR3L-1333(667mhz) SDRAM sodimm

and, as of bank organization : [ Table 2 ] 2Gb DDR3 C-die Speed bins Organization -DDR3L-1066 (7-7-7) ---DDR3L-1333 (9-9-9) ----- 512Mx4 ------K4B2G0446C-HYF8 ------K4B2G0446C-HYH9

512Mx4 is 2Gb, so 8 of these should be 4Gb. (Please, confirm XD )

But my system says [root@alarm sys]# cat /proc/meminfo MemTotal: 2030724 kB

possible causes : 1) one or more memory chips are "weak" , they can't work at their nominal frequency/timing, bringing down the whole 4 chips bank (2Gb) . (Can I check the working frequency of my ram?)

2) fake Samsung chips (Can I check how many ram modules does the system see?)

3) ram limit somewhere , for compatibility/stability reasons (according to armbian forums something similar happened with Alwinner H6, which had problems with more than 3gb ram. H6 and H616/H313 are very similar, but I didn't read anywhere that H313 has the same 3gb problem. Some armbian user found a workaround for this, I will see)

warpme commented 1 year ago

Well, As Anwol Q86x (H313) has 8 ram chips and uses 512Mx4 chips...It means you have 2GB device. (512Mx4 chip is 256MB chip. 8x256MB chips seems 2GB to me...)

mercs759 commented 1 year ago

Screenshot_20230507-123423~2

From this table I understand that I can get 2Gb with 4 446 chips, or with 8 846. mine are 446... (i'm confused)

warpme commented 1 year ago

Well. Both in above table are 2Gbit chips (pls see table title). 8 chips, 2Gbit each giving 16GBit total. As each byte is 8 bits, 16GBit=2Gbytes Hope this helps you!

ps: false labeling (2GB box sold you as 4GB) is almost normal practice in this market. You know - it is bussines style by Chin***...

mercs759 commented 1 year ago

ok, I was misleaded by "cpu-z" and "device info HW" under stock's android ... also installing termux and running "free"... all of them reported 4GB, but probably just took the info from TV box producer's "BIOS".

i'll try do play with ramdisks under android and see what happens. 🤣

mercs759 commented 1 year ago

You are right.
Each "hyh9 k4b2g0446c" chip is 2Gbits ,or "512Mx4" (M= Mbits) ... 8 chips are 16Gbits = 2GBytes. Problem solved. My fault. XD

warpme commented 1 year ago

Thx. So lets close this ticket :-)