在2023年11月23日十一月 下午3:26，Gregory CLEMENT写道： > Hello, > > The EyeQ5 SoC from Mobileye is based on the MIPS I6500 architecture > and features multiple controllers such as the classic UART, I2C, SPI, > as well as CAN-FD, PCIe, Octal/Quad SPI Flash interface, Gigabit > Ethernet, MIPI CSI-2, and eMMC 5.1. It also includes a Hardware > Security Module, Functional Safety Hardware, and MJPEG encoder. > > One peculiarity of this SoC is that the physical address of the DDDR > exceeds 32 bits. Given that the architecture is 64 bits, this is not > an issue, but it requires some changes in how the mips64 is currently > managed during boot. > > This second version comes a few weeks after the first one, because > there several iteration to support having kernel code outside kseg. > > To build and test the > kernel, we need to run the following commands: > > make 64r6el_defconfig BOARDS=eyeq5 > make vmlinuz.itb > > In order to get ride of the aliasing patch I got, I followed Jiaxun > Yang suggestion by splitting the memory in 2 part: low part under > 512MB and high part beyond the 4GB. It allows to boot and run Linux on > the platform however as a side effect the number of pages used for > memmap passed from 512 to 8672 which is a huge consumption of > pages. Do you know if there is a way to reduce it ? The best workaround is to enable SPARSEMEM, that's why I sent[1] :-) I'm going to reversion my XKPHYS work to fix some other issues I found. [1]: https://lore.kernel.org/linux-mips/20231028-mm-v1-0-45377cd158cf@xxxxxxxxxxx/ > > I also noticed that if the kernel can't be in kseg0 at all by using > low memory at 0x40000000, then I got the following message during > boot: > -- - Jiaxun
