Created
June 7, 2018 13:54
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md: use prestaged mfs_root | |
On PowerNV systems, the rootfs is passed through kexec, which loads the rootfs | |
into memory and set two fdt entries to describe where the file is located in | |
the memory; | |
I need to pass this memory region to the md device as a mfs_root, but, current | |
md driver does not support two things: | |
* Just getting a pointer from an external (bootloader) memory. If I need to | |
workaround it, I would need to declare a static array and memcopy from this | |
external memory to this static variable. | |
* The size of the image. The usage of mfs_root_end, which is not a pointer, | |
seems to be not possible for this prestaged scenario. | |
This patch simply adds a new way to load mfs_root from memory. | |
Differential Revision: https://reviews.freebsd.org/D15625 | |
Approved by: kib, jhibbits (mentor) |
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