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Reduce RAM to 768 MiB to avoid a memory problem

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This commit is contained in:
Rodrigo Arias 2024-07-10 18:04:11 +02:00
parent 28efecdbc7
commit b7dba89d63
3 changed files with 40 additions and 15 deletions
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23
JOURNAL.md
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@ -1206,3 +1206,26 @@ the actual physical memory.
I will try a similar test with uboot with the `mtest` command, but requires
enabling it first.
### OBSERVATION: Memory in the 0xb0000000..0xc0000000 range is bad
Reproduced from U-Boot:
=> mtest 0x80000000 0x90000000 0 2
Testing 80000000 ... 90000000:
Pattern FFFFFFFFFFFFFFFF Writing... Reading...Iteration: 2
Tested 2 iteration(s) with 0 errors.
=> mtest 0x90000000 0xa0000000 0 2
Testing 90000000 ... a0000000:
Pattern FFFFFFFFFFFFFFFF Writing... Reading...Iteration: 2
Tested 2 iteration(s) with 0 errors.
=> mtest 0xa0000000 0xb0000000 0 2
Testing a0000000 ... b0000000:
Pattern FFFFFFFFFFFFFFFF Writing... Reading...Iteration: 2
Tested 2 iteration(s) with 0 errors.
=> mtest 0xb0000000 0xc0000000 0 2
Testing b0000000 ... c0000000:
Pattern 0000000000000000 Writing...
Let's see if we can fix the boot hang by reducing the memory enough to avoid
this bad region.

25
lagarto-ox.nix
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@ -132,17 +132,17 @@
''
echo 0 > /proc/sys/vm/compaction_proactiveness
''
+
# Show stacktrace on calls to the hvc_remove function.
''
echo "Mount debugfs"
mkdir -p /sys/kernel/debug/
mount -t debugfs none /sys/kernel/debug/
td=/sys/kernel/debug/tracing
echo hvc_remove > $td/set_ftrace_filter
echo function > $td/current_tracer
echo 1 > $td/options/func_stack_trace
''
# +
# # Show stacktrace on calls to the hvc_remove function.
# ''
# echo "Mount debugfs"
# mkdir -p /sys/kernel/debug/
# mount -t debugfs none /sys/kernel/debug/
# td=/sys/kernel/debug/tracing
# echo hvc_remove > $td/set_ftrace_filter
# echo function > $td/current_tracer
# echo 1 > $td/options/func_stack_trace
# ''
# FIXME: Disable sched_switch for now, as it still hangs the boot...
# +
# # Exclude the second pid, which is the kthread that will dump the trace to
@ -288,6 +288,7 @@
fdt set /memory@80000000 reg <0x0 0x80000000 0x0 0xc0000000>
# Set kernel bootcmd options.
# rdinit=/init2 boot custom init script
# NixOS interesting options:
# debug1 enable debug shell in stage 1
# boot.trace enable set -x in stage 1
@ -298,7 +299,7 @@
# tp_printk write ftrace events to console
# trace_buf_size=1M set ftrace buffer to 1M
#
setenv bootargs "root=/dev/ram0 loglevel=7 debug rw earlycon=sbi console=hvc0 tp_printk trace_buf_size=1M rdinit=/init2 init=${init}"
setenv bootargs "root=/dev/ram0 loglevel=7 debug rw earlycon=sbi console=hvc0 init=${init}"
EOF

7
ox-plic.dts
View File

@ -70,14 +70,15 @@
*
* [0x0_6000_0000, 0x0_7000_0000) -> DMA pool (256 MiB)
* [0x0_7000_0000, 0x0_8000_0000) -> DMA pool (256 MiB)
* [0x0_8000_0000, 0x0_fff0_0000) -> RAM memory (1024 MiB)
* [0x0_fff0_0000, 0x1_0000_0000) -> Empty (1024 MiB)
* [0x0_8000_0000, 0x0_b000_0000) -> RAM memory (768 MiB)
* [0x0_b000_0000, 0x0_c000_0000) -> Broken? (256 MiB)
* [0x0_c000_0000, 0x1_0000_0000) -> Empty (1024 MiB)
* [0x1_0000_0000, 0x1_c000_0000) -> PMEM (3072 MiB)
* [0x1_c000_0000, 0x2_8000_0000) -> Empty (3072 MiB)
*/
memory@80000000 {
device_type = "memory";
reg = <0x0 0x80000000 0x0 0x40000000>;
reg = <0x0 0x80000000 0x0 0x30000000>;
};
reserved-memory {
#address-cells = <2>; /* Starting address and size */