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MIPS: implement device-tree handover to Linux kernel 

Add device-tree handover to Linux kernel conforming with MIPS UHI [1].
Register $a0 will be set to the reserved value -2. The address of
the device-tree blob will be stored as KSEG0 address in $a1. $a2 and
$a3 are set to zero.

[1] http://prplfoundation.org/wiki/MIPS_documentation

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
This commit is contained in:
Daniel Schwierzeck 2015-02-22 16:58:30 +01:00
parent d8c1d5d5fb
commit 90b1c9fad7
2 changed files with 8 additions and 7 deletions
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9
arch/mips/Kconfig
View File

@ -141,15 +141,12 @@ config MIPS_BOOT_ENV_LEGACY
The address of the enviroment is stored in register $a2. The address of the enviroment is stored in register $a2.
config MIPS_BOOT_FDT config MIPS_BOOT_FDT
bool "Hand over a flattened device tree to Linux kernel (INCOMPLETE)" bool "Hand over a flattened device tree to Linux kernel"
default n default n
help help
Enable this option if you want U-Boot to hand over a flattened Enable this option if you want U-Boot to hand over a flattened
device tree to the kernel. device tree to the kernel. According to UHI register $a0 will be set
to -2 and the FDT address is stored in $a1.
Note: the final hand over to the kernel is not yet implemented. After
the community agreed on the MIPS boot interface for device trees,
the corresponding code will be added.
endmenu endmenu

6
arch/mips/lib/bootm.c
View File

@ -317,7 +317,11 @@ static void boot_jump_linux(bootm_headers_t *images)
bootstage_report(); bootstage_report();
#endif #endif
kernel(linux_argc, (ulong)linux_argv, (ulong)linux_env, linux_extra); if (images->ft_len)
kernel(-2, (ulong)images->ft_addr, 0, 0);
else
kernel(linux_argc, (ulong)linux_argv, (ulong)linux_env,
linux_extra);
} }
int do_bootm_linux(int flag, int argc, char * const argv[], int do_bootm_linux(int flag, int argc, char * const argv[],