hi, i am using 24KC soc, and linux2.6.21.5 kernel and set CONFIG_HIGHMEM enable. if my realy physic RAM is not more than HIGHMEM, such as only 32MB, it is some issue about kernel, i dont know how to fix it? I try linux-2.6.31.4, it is no this issue, is it some change , how to fix it? here is my kernel log: Linux version 2.6.21.5 (figo@myhost) (gcc version 4.1.2) #22 Fri Dec 4 10:33:25 CST 2009 CPU revision is: 00019655 Determined physical RAM map: memory: start:0x0,size=0x2000000,type=0x1 (usable) User-defined physical RAM map: memory: start:0x0,size=0x2000000,type=0x1 (usable) Initrd not found or empty - disabling initrd Built 1 zonelists. Total pages: 8128 Kernel command line: console=ttyS0,115200 rdinit=/linuxrc mem=32M nofpu mac=00:aa:aa:bb:bb:99 Updated MAC address from u-boot: 8024ff24M Primary instruction cache 32kB, physically tagged, 4-way, linesize 32 bytes. Primary data cache 32kB, 4-way, linesize 32 bytes. Synthesized TLB refill handler (20 instructions). Synthesized TLB load handler fastpath (32 instructions). Synthesized TLB store handler fastpath (32 instructions). Synthesized TLB modify handler fastpath (31 instructions). Cache parity protection disabled arch/mips/mach-opulan/optrann/irq.c,arch_init_irq PID hash table entries: 128 (order: 7, 512 bytes) Using 150.000 MHz high precision timer. arch/mips/mach-opulan/optrann/time.c,plat_timer_setup Dentry cache hash table entries: 4096 (order: 2, 16384 bytes) Inode-cache hash table entries: 2048 (order: 1, 8192 bytes) Memory: 29012k/32768k available (1798k kernel code, 3756k reserved, 369k data, 900k init, 0k highmem) Mount-cache hash table entries: 512 NET: Registered protocol family 16 Generic PHY: Registered new driver Time: MIPS clocksource has been installed. NET: Registered protocol family 2 IP route cache hash table entries: 1024 (order: 0, 4096 bytes) TCP established hash table entries: 1024 (order: 1, 8192 bytes) TCP bind hash table entries: 1024 (order: 0, 4096 bytes) TCP: Hash tables configured (established 1024 bind 1024) TCP reno registered Installing knfsd (copyright (C) 1996 okir@xxxxxxxxxxxx). io scheduler noop registered io scheduler anticipatory registered (default) io scheduler deadline registered io scheduler cfq registered Serial: optrann serial driver $Revision: 1.0 uart_register_driver finished ttyS0 at MMIO map 0xbf004000 mem 0xbf004000 (irq = 23) is a UART 0 RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize loop: loaded (max 8 devices) nbd: registered device at major 43 optrann_fe_ether Ethernet driver, V1.00 FE:dmac_regs =0xbf014000,msg_regs=0xbf028000, irq=26 FE MAC: 00:aa:aa:bb:bb:99 TCP cubic registered Freeing unused kernel memory: 900k freed ramdisk_execute_command=/linuxrc, execute_command=<NULL> Bad pte = 0135c79f, process = linuxrc, vm_flags = 100073, vaddr = 2aaae000 Call Trace: [<80048d70>] dump_stack+0x8/0x34 [<8009ebb0>] vm_normal_page+0x68/0x90 [<8009f850>] unmap_vmas+0x1e8/0x5e8 [<800a3428>] unmap_region+0x9c/0x184 [<800a4268>] do_munmap+0x1b0/0x25c [<800a4358>] sys_munmap+0x44/0x70 [<8004af40>] stack_done+0x20/0x3c Bad pte = 0135e79f, process = linuxrc, vm_flags = 100073, vaddr = 2aaae000 Call Trace: [<80048d70>] dump_stack+0x8/0x34 [<8009ebb0>] vm_normal_page+0x68/0x90 [<8009f850>] unmap_vmas+0x1e8/0x5e8 [<800a3428>] unmap_region+0x9c/0x184 [<800a4268>] do_munmap+0x1b0/0x25c [<800a4358>] sys_munmap+0x44/0x70 [<8004af40>] stack_done+0x20/0x3c Bad pte = 0026079f, process = linuxrc, vm_flags = 100073, vaddr = 2aaae000 Call Trace: [<80048d70>] dump_stack+0x8/0x34 [<8009ebb0>] vm_normal_page+0x68/0x90 [<8009f850>] unmap_vmas+0x1e8/0x5e8 [<800a3428>] unmap_region+0x9c/0x184 [<800a4268>] do_munmap+0x1b0/0x25c [<800a4358>] sys_munmap+0x44/0x70 [<8004af40>] stack_done+0x20/0x3c ......... Best, Figo.zhang
