Hi Dragan,
On 1/26/24 12:33, Dragan Simic wrote:
On 2024-01-26 12:29, Quentin Schulz wrote:
On 1/26/24 12:24, Dragan Simic wrote:
On 2024-01-26 12:09, Quentin Schulz wrote:
On 1/26/24 12:04, Dragan Simic wrote:
On 2024-01-26 11:37, Quentin Schulz wrote:
On 1/26/24 03:57, Kever Yang wrote: > On 2024/1/25 19:02, Quentin Schulz wrote: >> We don't have a dedicated CD pin for the SD card connector. >> https://www.digikey.com/en/products/detail/molex/0472192001/3044807 >> is the SD card connector we use. > > Thanks for your information, but I think you are using the wrong > microSD connector for rk3588 and maybe also for other rockchip SoCs. > Here are four microSD card connector from the web you provide, all > of > them have card detect signal available for pcb: > https://www.digikey.com/en/product-highlight/m/molex-connector/sd-memory-car...
None of those fit our requirements. We need a safe system that doesn't break because of vibrations or shocks. Push-pull connectors are out of question for our design. We have had issues with our Q7 devkit with push-pull connector with SD cards slightly smaller or inserted somewhat the wrong way. I can recall also countless of discussions in the early days of the Raspberry Pis where there were a lot of issues related to SD cards.
This is basically the mechanism we are using https://media.distrelec.com/Web/WebShopImages/landscape_large/4-/01/Molex-50...
Please, allow me to interject... I'm really curious why don't you use eMMC chips instead of microSD cards? I mean, if the reliability is of utmost importance, I wouldn't even consider microSD cards, not even the high-endurance variants.
We have both :)
Ah, I see. :) Perhaps my question wasn't precise enough; actually, now I'd like to know what do you use as the primary storage for the operating system installation -- eMMC chip or microSD cards? Is the eMMC chip soldered? I'm just curious. :)
Soldered eMMC is the primary (expected) storage. If both eMMC and SD card are inserted and properly flashed, it'll boot from eMMC except if the BIOS button is pressed, in which case SD card will be selected instead. If SD card is missing/improperly flashed, it'll boot into USB flashing mode (rkdeveloptool/rockusb) if the BIOS button is pressed (similar to when no storage media is properly flashed).
Thanks for the clarification. Just one more question, please: is the BIOS button handled in software (i.e. in U-Boot), or does it disable the eMMC chip by shorting its clock or a data line to ground?
None of those options :)
On RK3588, the boot media selection and order is done via the channel 0 of the SARADC. So a specific voltage is provided to boot from eMMC or from SD card.
Quentin