From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Tue, 5 Jul 2011 14:38:17 +1000 From: Tony Breeds To: LinuxPPC-dev , Josh Boyer , Benjamin Herrenschmidt Subject: [PATCH 3/3] powerpc/44x: boot wrapper: allow kernel to load into non-zero address Message-ID: <20110705043817.GH13483@ozlabs.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 In-Reply-To: <20110705043657.GF13483@ozlabs.org> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Dave Kleikamp For AMP, different kernel instances load into separate memory regions. Read the start of memory from the device tree and limit the memory to what's specified in the device tree. Signed-off-by: Dave Kleikamp Signed-off-by: Tony Breeds Cc: Benjamin Herrenschmidt Cc: Josh Boyer Cc: linuxppc-dev@lists.ozlabs.org --- arch/powerpc/boot/treeboot-iss4xx.c | 23 ++++++++++++++++++++++- 1 files changed, 22 insertions(+), 1 deletions(-) diff --git a/arch/powerpc/boot/treeboot-iss4xx.c b/arch/powerpc/boot/treeboot-iss4xx.c index fcc4495..329e710 100644 --- a/arch/powerpc/boot/treeboot-iss4xx.c +++ b/arch/powerpc/boot/treeboot-iss4xx.c @@ -34,9 +34,29 @@ BSS_STACK(4096); +static u32 ibm4xx_memstart; + static void iss_4xx_fixups(void) { - ibm4xx_sdram_fixup_memsize(); + void *memory; + u32 reg[3]; + + memory = finddevice("/memory"); + if (!memory) + fatal("Can't find memory node\n"); + /* This assumes #address-cells = 2, #size-cells =1 and that */ + getprop(memory, "reg", reg, sizeof(reg)); + if (reg[2]) + /* If the device tree specifies the memory range, use it */ + ibm4xx_memstart = reg[1]; + else + /* othersize, read it from the SDRAM controller */ + ibm4xx_sdram_fixup_memsize(); +} + +static void *iss_4xx_vmlinux_alloc(unsigned long size) +{ + return (void *)ibm4xx_memstart; } #define SPRN_PIR 0x11E /* Processor Indentification Register */ @@ -48,6 +68,7 @@ void platform_init(void) simple_alloc_init(_end, avail_ram, 128, 64); platform_ops.fixups = iss_4xx_fixups; + platform_ops.vmlinux_alloc = iss_4xx_vmlinux_alloc; platform_ops.exit = ibm44x_dbcr_reset; pir_reg = mfspr(SPRN_PIR); fdt_set_boot_cpuid_phys(_dtb_start, pir_reg); -- 1.7.4.4