Bug of 1G memory use.
*Description:*
When allow system using more than 512M of memory, user level apps
execution can cause ‘Segmentation fault’ or glibc error.
*
Reproduction:*
*On PandaBoard:*
_In bootstrap_: in /base-foc/contrib/l4/mk/platforms/pandaboard.conf/
if set
/PLATFORM_RAM_SIZE_MB = *1024*/
(whole physical memory present on PandaBoard)//
//
And if allow L4Linux using more than 512M memory:
when modify run script: ‘/ports-foc/run/linux_panda.run’:/__
<start name="vmlinux.1" priority="-1">
<binary name="l4linux"/>
<resource name="RAM" quantum="796M"/>
<config args="mem=*754M* l4x_rd=initrd.gz">
<block label="sda" />
</config>
</start>
*(754M* is given for example*)*
System boots up. But user level apps can cause ‘Segmentation fault’ or
glibc error.
Error is stable on command ‘*find*’ on fresh-booted system.
*On**QEMU:***
To support 1G of memory on Realview platform file
‘/base-foc/contrib/l4/pkg/bootstrap/server/src/platform/rv.cc’/
(attached) was modified. (Address regions got from platform documentation.)
On system boot below error occurs:
/Assertion failed: 'idx < _nchips' [ret=0xf006f214]/
//Projects/l4bsdd/base-foc/contrib/kernel/fiasco/src/kern/irq_mgr_multi_chip.cpp:76
at f0007c00/
There is no such error if Fiasco.OC was built with –O1 gcc option (only
with –O2), but L4Linux can’t boot anyway because of memory allocation error.
Best regards,
Vladimir Shilkin
/*!
* \file support_rv.cc
* \brief Support for the rv platform
*
* \date 2008-01-02
* \author Adam Lackorznynski <[email protected]>
*
*/
/*
* (c) 2008-2009 Author(s)
* economic rights: Technische Universit채t Dresden (Germany)
*
* This file is part of TUD:OS and distributed under the terms of the
* GNU General Public License 2.
* Please see the COPYING-GPL-2 file for details.
*/
#include "support.h"
#include <l4/drivers/uart_pl011.h>
namespace {
class Platform_arm_rv : public Platform_single_region_ram
{
bool probe() { return true; }
void init()
{
static L4::Io_register_block_mmio r(0x10009000);
static L4::Uart_pl011 _uart;
_uart.startup(&r);
set_stdio_uart(&_uart);
}
void setup_memory_map(l4util_mb_info_t *,
Region_list *ram, Region_list *)
{
ram->add(Region::n(0x70000000, 0x80000000, ".ram", Region::Ram)); //main SDRAM as it defined in realview.c (QUEMU sources)
ram->add(Region::n(0x80000000, 0x90000000, ".ram", Region::Ram)); //make the second 256 MB SDRAM avaliable.
//In case of QEMU you must run it with -m 512 or higher.
ram->add(Region::n(0x20000000, 0x40000000, ".ram", Region::Ram)); //make the third 512 MB SDRAM avaliable. Here we have 1024MB total!
//In case of QEMU you must run it with -m 1024 or higher.
}
};
}
REGISTER_PLATFORM(Platform_arm_rv);
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