Hi, On Tue, May 13, 2014 at 9:09 PM, Siarhei Siamashka <siarhei.siamas...@gmail.com> wrote: > Hi, > > There is the following page on the cubieboard.org website: > http://cubieboard.org/2014/01/13/upgrade-new-android-for-cubietruckv1-01/ > It provides an SD card image, with the following description "We don’t > need it bootup, just clean some register value on PMU". > > So I wonder if there is some storage space there to save the information > about the CPU and DRAM "speed grade"? Or if the space is too small, > then just some sort of a board type identifier might be also enough. > This identifier could be used as a key for a table look-up in the > u-boot bootloader to find the necessary information about the hardware.
The AXP209 has 12 bytes of general purpose memory (register address 0x04 - 0x0f). Though it seems Allwinner code may be using some of it? > Also if the AXP209 is no good, then maybe some other non-volatile memory > in the A10/A13/A20 SoC exists? I have read about EFUSE, but it looks > like the EFUSE power pin is typically grounded and nobody can write > anything there. Any other commonly used and easy/safe to autodetect > storage option in the sunxi hardware? The A20 Timer block has 16 general purpose registers for storing data, powered by RTC. Something similar should be available on the other SoCs. > It looks like TWI1 is used for connecting EEPROM in the A10-Lime. And > TWI2 is used for VGA DDC in the Cubietruck. Are we up to having some > sort of a common "standard" at least for the development boards, so > that the same u-boot build could be used for all of them? Cheers ChenYu -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
