This patch didn't make mainline yet (3.15-rc6).
This is required for booting in the PowerNV (non-virtualized) platform in
little-endian mode.
Sources:
-
https://github.com/torvalds/linux/commit/5072b7ba14de2b02b1d68f85dc5e81980e1818e7
- http://patchwork.ozlabs.org/patch/350461/
Signed-off-by: Mauricio Faria de Oliveira mauri...@linux.vnet.ibm.com
---
...el-powernv-calls-to-support-little-endian.patch | 94
debian/patches/series |1 +
2 files changed, 95 insertions(+), 0 deletions(-)
create mode 100644
debian/patches/bugfix/powerpc/ppc64el-powernv-calls-to-support-little-endian.patch
diff --git
a/debian/patches/bugfix/powerpc/ppc64el-powernv-calls-to-support-little-endian.patch
b/debian/patches/bugfix/powerpc/ppc64el-powernv-calls-to-support-little-endian.patch
new file mode 100644
index 000..815ff98
--- /dev/null
+++
b/debian/patches/bugfix/powerpc/ppc64el-powernv-calls-to-support-little-endian.patch
@@ -0,0 +1,94 @@
+https://github.com/torvalds/linux/commit/5072b7ba14de2b02b1d68f85dc5e81980e1818e7
+
+From 5072b7ba14de2b02b1d68f85dc5e81980e1818e7 Mon Sep 17 00:00:00 2001
+From: Benjamin Herrenschmidt b...@kernel.crashing.org
+Date: Wed, 21 Aug 2013 14:52:31 +1000
+Subject: [PATCH] powerpc/powernv: Add calls to support little endian
+
+Signed-off-by: Benjamin Herrenschmidt b...@kernel.crashing.or
+Forward-ported-by: Mauricio Faria de Oliveira mauri...@linux.vnet.ibm.com
+
+Index: linux-3.15-rc5/arch/powerpc/include/asm/opal.h
+===
+--- linux-3.15-rc5.orig/arch/powerpc/include/asm/opal.h2014-05-09
17:10:52.0 -0300
linux-3.15-rc5/arch/powerpc/include/asm/opal.h 2014-05-19
15:31:37.0 -0300
+@@ -154,6 +154,7 @@
+ #define OPAL_LPC_READ 67
+ #define OPAL_LPC_WRITE68
+ #define OPAL_RETURN_CPU 69
++#define OPAL_REINIT_CPUS 70
+ #define OPAL_ELOG_READ71
+ #define OPAL_ELOG_WRITE 72
+ #define OPAL_ELOG_ACK 73
+@@ -725,6 +726,11 @@
+ uint64_t pestB[OPAL_PHB3_NUM_PEST_REGS];
+ };
+
++enum {
++ OPAL_REINIT_CPUS_HILE_BE= (1 0),
++ OPAL_REINIT_CPUS_HILE_LE= (1 1),
++};
++
+ typedef struct oppanel_line {
+ const char *line;
+ uint64_tline_len;
+@@ -849,6 +855,7 @@
+ uint16_t *pci_error_type, uint16_t *severity);
+ int64_t opal_pci_poll(uint64_t phb_id);
+ int64_t opal_return_cpu(void);
++int64_t opal_reinit_cpus(uint64_t flags);
+
+ int64_t opal_xscom_read(uint32_t gcid, uint64_t pcb_addr, __be64 *val);
+ int64_t opal_xscom_write(uint32_t gcid, uint64_t pcb_addr, uint64_t val);
+Index: linux-3.15-rc5/arch/powerpc/platforms/powernv/opal-wrappers.S
+===
+--- linux-3.15-rc5.orig/arch/powerpc/platforms/powernv/opal-wrappers.S
2014-05-09 17:10:52.0 -0300
linux-3.15-rc5/arch/powerpc/platforms/powernv/opal-wrappers.S
2014-05-19 15:31:37.0 -0300
+@@ -124,6 +124,7 @@
+ OPAL_CALL(opal_lpc_read, OPAL_LPC_READ);
+ OPAL_CALL(opal_lpc_write, OPAL_LPC_WRITE);
+ OPAL_CALL(opal_return_cpu,OPAL_RETURN_CPU);
++OPAL_CALL(opal_reinit_cpus, OPAL_REINIT_CPUS);
+ OPAL_CALL(opal_read_elog, OPAL_ELOG_READ);
+ OPAL_CALL(opal_send_ack_elog, OPAL_ELOG_ACK);
+ OPAL_CALL(opal_get_elog_size, OPAL_ELOG_SIZE);
+Index: linux-3.15-rc5/arch/powerpc/platforms/powernv/opal.c
+===
+--- linux-3.15-rc5.orig/arch/powerpc/platforms/powernv/opal.c 2014-05-09
17:10:52.0 -0300
linux-3.15-rc5/arch/powerpc/platforms/powernv/opal.c 2014-05-19
15:31:37.0 -0300
+@@ -57,6 +57,21 @@
+ static uint64_t last_notified_mask = 0x0ul;
+ static atomic_t opal_notifier_hold = ATOMIC_INIT(0);
+
++static void opal_reinit_cores(void)
++{
++ /* Do the actual re-init, This will clobber all FPRs, VRs, etc...
++ *
++ * It will preserve non volatile GPRs and HSPRG0/1. It will
++ * also restore HIDs and other SPRs to their original value
++ * but it might clobber a bunch.
++ */
++#ifdef __BIG_ENDIAN__
++ opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_BE);
++#else
++ opal_reinit_cpus(OPAL_REINIT_CPUS_HILE_LE);
++#endif
++}
++
+ int __init early_init_dt_scan_opal(unsigned long node,
+ const char *uname, int depth, void *data)
+ {
+@@ -96,6 +111,13 @@
+ printk(OPAL V1 detected !\n);
+ }
+
++ /* Reinit all cores with the right endian */
++ opal_reinit_cores();
++
++ /* Restore some bits */
++ if (cur_cpu_spec-cpu_restore)
++
