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openrisc: Add support for external initrd images

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In OpenRISC we set the initrd_start and initrd_end based on the symbols
we setup in vmlinux.lds.S.  However, this is not needed if we use the
generic linker description in INIT_DATA_SECTION.

Removing our own initrd setup reduces code, but also the generic code
supports loading external initrd images.  A bootloader can load a rootfs
image into memory and we can configure devicetree to load it with:

        chosen {
                bootargs = "earlycon";
                stdout-path = "uart0:115200";
                linux,initrd-start = < 0x08000100 >;
                linux,initrd-end = < 0x08200000 >;
        };

Reported-by: Mateusz Holenko <mholenko@antmicro.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Stafford Horne 2020-07-05 05:53:49 +09:00
parent d0b7213f89
commit ff6c923dbe
2 changed files with 5 additions and 15 deletions
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8
arch/openrisc/kernel/setup.c
View File

@ -292,13 +292,15 @@ void __init setup_arch(char **cmdline_p)
init_mm.brk = (unsigned long)_end;
#ifdef CONFIG_BLK_DEV_INITRD
initrd_start = (unsigned long)&__initrd_start;
initrd_end = (unsigned long)&__initrd_end;
if (initrd_start == initrd_end) {
printk(KERN_INFO "Initial ramdisk not found\n");
initrd_start = 0;
initrd_end = 0;
} else {
printk(KERN_INFO "Initial ramdisk at: 0x%p (%lu bytes)\n",
(void *)(initrd_start), initrd_end - initrd_start);
initrd_below_start_ok = 1;
}
initrd_below_start_ok = 1;
#endif
/* setup memblock allocator */

12
arch/openrisc/kernel/vmlinux.lds.S
View File

@ -96,18 +96,6 @@ SECTIONS
__init_end = .;
. = ALIGN(PAGE_SIZE);
.initrd : AT(ADDR(.initrd) - LOAD_OFFSET)
{
__initrd_start = .;
*(.initrd)
__initrd_end = .;
FILL (0);
. = ALIGN (PAGE_SIZE);
}
__vmlinux_end = .; /* last address of the physical file */
BSS_SECTION(0, 0, 0x20)
_end = .;