我想在启动 Linux 时保留一部分物理内存。常见的内核参数应该是“mem=51M memmap=512M$512M”。如何为 Spike 的内核指定这些参数？
我的 Spike 执行命令是：
u@ubuntu14.04:~/riscv$ spike -m2048 +disk=./root.bin bbl ./linux-3.14.33/vmlinux
vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
vvvvvvvvvvvvvvvvvvvvvvvvvvvv
rrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvvvvvv
rrrrrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvvvv
rrrrrrrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvvvv
rrrrrrrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvvvv
rrrrrrrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvvvv
rrrrrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvv
rrrrrrrrrrrrr vvvvvvvvvvvvvvvvvvvvvv
rr vvvvvvvvvvvvvvvvvvvvvv
rr vvvvvvvvvvvvvvvvvvvvvvvv rr
rrrr vvvvvvvvvvvvvvvvvvvvvvvvvv rrrr
rrrrrr vvvvvvvvvvvvvvvvvvvvvv rrrrrr
rrrrrrrr vvvvvvvvvvvvvvvvvv rrrrrrrr
rrrrrrrrrr vvvvvvvvvvvvvv rrrrrrrrrr
rrrrrrrrrrrr vvvvvvvvvv rrrrrrrrrrrr
rrrrrrrrrrrrrr vvvvvv rrrrrrrrrrrrrr
rrrrrrrrrrrrrrrr vv rrrrrrrrrrrrrrrr
rrrrrrrrrrrrrrrrrr rrrrrrrrrrrrrrrrrr
rrrrrrrrrrrrrrrrrrrr rrrrrrrrrrrrrrrrrrrr
rrrrrrrrrrrrrrrrrrrrrr rrrrrrrrrrrrrrrrrrrrrr
INSTRUCTION SETS WANT TO BE FREE
[ 0.000000] Linux version 3.14.33-g043bb5d (guanglin@guanglin-a11-linux) (gcc version 5.2.0 (GCC) ) #2 Sun Aug 23 17:19:49 EDT 2015
[ 0.000000] Detected 0x7fc00000 bytes of physical memory
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x00200000-0x7fdfffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x00200000-0x7fdfffff]
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 516110
[ 0.000000] Kernel command line: root=/dev/htifblk0
[ 0.000000] PID hash table entries: 4096 (order: 3, 32768 bytes)
[ 0.000000] Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
[ 0.000000] Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
[ 0.000000] Sorting __ex_table...
[ 0.000000] Memory: 2058700K/2093056K available (1722K kernel code, 124K rwdata, 356K rodata, 68K init, 211K bss, 34356K reserved)
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS:2
[ 0.150000] Calibrating delay using timer specific routine.. 20.01 BogoMIPS (lpj=100050)
[ 0.150000] pid_max: default: 32768 minimum: 301
[ 0.150000] Mount-cache hash table entries: 4096 (order: 3, 32768 bytes)
[ 0.150000] Mountpoint-cache hash table entries: 4096 (order: 3, 32768 bytes)
[ 0.150000] devtmpfs: initialized
[ 0.150000] NET: Registered protocol family 16
[ 0.150000] bio: create slab <bio-0> at 0
[ 0.150000] Switched to clocksource riscv_clocksource
[ 0.150000] NET: Registered protocol family 2
[ 0.150000] TCP established hash table entries: 16384 (order: 5, 131072 bytes)
[ 0.150000] TCP bind hash table entries: 16384 (order: 5, 131072 bytes)
[ 0.150000] TCP: Hash tables configured (established 16384 bind 16384)
[ 0.150000] TCP: reno registered
[ 0.150000] UDP hash table entries: 1024 (order: 3, 32768 bytes)
[ 0.150000] UDP-Lite hash table entries: 1024 (order: 3, 32768 bytes)
[ 0.150000] NET: Registered protocol family 1
[ 0.150000] futex hash table entries: 256 (order: 0, 6144 bytes)
[ 0.150000] io scheduler noop registered
[ 0.150000] io scheduler cfq registered (default)
[ 0.150000] htifcon htif1: detected console
[ 0.150000] console [htifcon0] enabled
[ 0.150000] htifblk htif2: detected disk
[ 0.150000] htifblk htif2: added htifblk0
[ 0.150000] TCP: cubic registered
[ 0.150000] VFS: Mounted root (ext2 filesystem) readonly on device 254:0.
[ 0.150000] devtmpfs: mounted
[ 0.150000] Freeing unused kernel memory: 68K (ffffffff80000000 - ffffffff80011000)
[ 0.160000] EXT2-fs (htifblk0): warning: mounting unchecked fs, running e2fsck is recommended
/ #
我试过了
spike -m2048 +disk=./root.bin bbl ./linux-3.14.33/vmlinux mem=1G memmap=1G$1G
spike -m2048 +disk=./root.bin bbl ./linux-3.14.33/vmlinux mem=512M memmap=512M$512M
它们都不起作用。
如果我做
spike -m2048 +disk=./root.bin bbl "./linux-3.14.33/vmlinux mem=512M memmap=512M$512M"
无法打开 ELF 程序：./linux-3.14.33/vmlinux mem=512M memmap=512M12M！