forked from Minki/linux
mainlining shenanigans
4690803b09
The display backend, as well as other peripherals that have a DRAM
clock gate and access DRAM directly, bypassing the system bus,
address the DRAM starting from 0x0, while physical addresses the
system uses starts from 0x40000000 (or 0x20000000 in A80's case).
This issue was witnessed on the Cubietruck, which has 2GB of RAM.
Devices with less RAM function normally due to the DRAM address
wrapping around. CMA seems to always allocate its buffer at a
very high address, close to the end of DRAM.
On a 1GB RAM device, the physical address would be something like
0x78000000. The DRAM address 0x78000000 would access the same DRAM
region as 0x38000000 on a system, as the DRAM address would only
span 0x0 ~ 0x3fffffff. The bit 0x40000000 is non-functional in this
case.
However on the Cubietruck, the DRAM is 2GB. The physical address
is 0x40000000 ~ 0xbfffffff. The buffer would be something like
0xb8000000. But the DRAM address span 0x0 ~ 0x7fffffff, meaning
the buffer address wraps around to 0x38000000, which is wrong.
The correct DRAM address for it should be 0x78000000.
Correct the address configured into the backend layer registers
by PHYS_OFFSET to account for this.
Fixes:
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|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| firmware | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.