In this case, the reason can not be determined. All the algorithms of EMMC are universal and can not work through ISP. In general, it is reason of the main board.
power on the motherboard, and check the RST_ N of EMMC Whether RST_N pin is high level, if RST_ N is 0. It is necessary to pull up the pin, otherwise EMMC will not work.
Yes I applied 1.8 with external power. Pull Up RST_n dont change anything. Chip dont detect. When i add pull up resistors 22k to cmd and dat0. Chip detect, but with wrong csd and sid, and dont read and erase. I cant test it with adapter BGA221 because i cant find it to buy.
I tested many samsung and hynix chip bga221 EMMC v5.1 and all have detect problem. Only EMMC v5.1 have this problem. All lower version detect and read normal. Maybe this bug of programmer software.
When you build your own circuit and do ISP testing, pay attention to the following points:
1. External power supply voltage must be accurate, using linear regulated power supply.
2. all EMMC GND and VCC VCCQ must be connected.
3. you can buy EMMC bga221 adapter from dealer.
Over ISP I applied vccq and vcc external power accuracy stabilized. But samsung emmc detecting unstable. Please show your isp connection. Take a photo if possible. maybe something is wrong with my connection. But hynix, kingston, sandisk bga221 detect normal. even bga254 reads and writes well. Problems only with bga221. I can test a lot at your request.
Yes with such a connection it works, but it does not work if you connect a device with emmc samsung to isp directly. This is the problem I'm trying to solve. I add pull up resistor 22k to cmd and dat0. It solve problem whith detecting hynix but not sovled problem with samsung.
If you can see in log PNM, Product Date wrong. And it saying DAT0 is BUSY
Z3X work with this emmc fine over this isp adapter. And dont have any detecting problem. I have not idea about this trouble. Some Samsung BGA221 detecting and work fine, and some of it dont detect.
Maybe some of this ic needed lower detection speed in MHz.
I solved my problem with this IC. It's only detect when VCCQ 3.3V. Some other emmc also working only when VCCQ 3.3V. I dont now why. Z3X work fine with this IC when VCCQ 1.8V.
I would also like to ask you to add a choice which userdata size read. For example, FULL, 256MB, 512MB, 1GB. It is not always necessary to read a full dump and such a choice would be convenient. At the moment, to make a value through "multiple partition" for reading long and not convenient.
I also want to ask if you are planning to add work with the EMMC file system sections as in the example in the screenshot. It is necessary when you need to erase \ write some of the file system partitions and you have to read the dump and work with file system in other programms to do. It is not comfortable. I could become a tester for these functions.
Thanks for adding userdata reading size. It's great and very usefull. Admin you best! And i have question about jtag adding. I wait this many time from previous year.
JTAG is only a low-level interface, and the upper-level application software is not universal.
We have tested the hardware and low_level and there is no problem.
