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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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