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    Subject[BUG] 2.6.26-rc1 lost half the RAM on UltraSPARC 5
    Now that 2.6.26-rc1 boots on my Ultra5, I noticed that it
    reports having only 128MB RAM, while earlier kernels reported
    the correct amount: 256MB.

    A diff of the dmesg output from 2.6.25 and 2.6.26-rc1 shows:

    --- dmesg-2.6.25 2008-05-07 19:41:26.000000000 +0200
    +++ dmesg-2.6.26-rc1 2008-05-07 19:41:26.000000000 +0200
    @@ -1,24 +1,36 @@
    PROMLIB: Sun IEEE Boot Prom 'OBP 3.25.3 2000/06/29 14:12'
    PROMLIB: Root node compatible:
    -Linux version 2.6.25 (mikpe@sparge) (gcc version 4.2.3) #1 Thu Apr 17 19:53:16 CEST 2008
    +Linux version 2.6.26-rc1 (mikpe@sparge) (gcc version 4.2.3) #1 Wed May 7 17:41:33 CEST 2008
    console [earlyprom0] enabled
    ARCH: SUN4U
    Ethernet address: 08:00:20:fd:ec:1f
    Kernel: Using 1 locked TLB entries for main kernel image.
    Remapping the kernel... done.
    -[0000000200000000-fffff80000400000] page_structs=262144 node=0 entry=0/0
    -[0000000200000000-fffff80000800000] page_structs=262144 node=0 entry=1/0
    -[0000000200000000-fffff80000c00000] page_structs=262144 node=0 entry=2/0
    -[0000000200000000-fffff80001000000] page_structs=262144 node=0 entry=3/0
    OF stdout device is: /pci@1f,0/pci@1,1/SUNW,m64B@2
    -PROM: Built device tree with 46848 bytes of memory.
    -On node 0 totalpages: 32298
    +PROM: Built device tree with 46641 bytes of memory.
    +Top of RAM: 0x17f46000, Total RAM: 0xff40000
    +Memory hole size: 128MB
    +Entering add_active_range(0, 0, 16384) 0 entries of 256 used
    +Entering add_active_range(0, 32768, 49023) 1 entries of 256 used
    +Entering add_active_range(0, 49024, 49053) 2 entries of 256 used
    +Entering add_active_range(0, 49055, 49059) 3 entries of 256 used
    +[0000000200000000-fffff80000400000] page_structs=131072 node=0 entry=0/0
    +[0000000200000000-fffff80000800000] page_structs=131072 node=0 entry=1/0
    +Zone PFN ranges:
    + Normal 0 -> 49059
    +Movable zone start PFN for each node
    +early_node_map[4] active PFN ranges
    + 0: 0 -> 16384
    + 0: 32768 -> 49023
    + 0: 49024 -> 49053
    + 0: 49055 -> 49059
    +On node 0 totalpages: 32672
    Normal zone: 335 pages used for memmap
    Normal zone: 0 pages reserved
    - Normal zone: 31963 pages, LIFO batch:7
    + Normal zone: 32337 pages, LIFO batch:7
    Movable zone: 0 pages used for memmap
    Booting Linux...
    -Built 1 zonelists in Zone order, mobility grouping on. Total pages: 31963
    +Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32337
    Kernel command line: ro root=/dev/sda5
    PID hash table entries: 1024 (order: 10, 8192 bytes)
    clocksource: mult[28000] shift[16]
    @@ -27,11 +39,11 @@
    console handover: boot [earlyprom0] -> real [tty0]
    Dentry cache hash table entries: 32768 (order: 5, 262144 bytes)
    Inode-cache hash table entries: 16384 (order: 4, 131072 bytes)
    -Memory: 237256k available (1928k kernel code, 744k data, 144k init) [fffff80000000000,0000000017f46000]
    -SLUB: Genslabs=13, HWalign=32, Order=0-2, MinObjects=8, CPUs=1, Nodes=1
    -Calibrating delay using timer specific routine.. 800.81 BogoMIPS (lpj=4004065)
    +Memory: 127016k available (1920k kernel code, 744k data, 152k init) [fffff80000000000,0000000017f46000]
    +SLUB: Genslabs=13, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
    +Calibrating delay using timer specific routine.. 800.99 BogoMIPS (lpj=4004959)
    Mount-cache hash table entries: 512
    -net_namespace: 280 bytes
    +net_namespace: 344 bytes
    NET: Registered protocol family 16
    PCI: Probing for controllers.
    /pci@1f,0: SABRE PCI Bus Module
    This was with my 2.6.25 .config + make oldconfig. I also built
    2.6.26-rc1 with arch/sparc64/defconfig + minor tweaks to suit
    my machine, but that one also only found 128MB RAM.

    dmesg logs and .configs are in <http://user.it.uu.se/~mikpe/linux/sparge/>

    /Mikael


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