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Re: [PATCH 14/20] ppc440_sdram: Move RAM size check to ppc440_sdram_init

From: BALATON Zoltan
Subject: Re: [PATCH 14/20] ppc440_sdram: Move RAM size check to ppc440_sdram_init
Date: Wed, 7 Sep 2022 16:41:09 +0200 (CEST) 
On Wed, 7 Sep 2022, Cédric Le Goater wrote:

On 8/19/22 18:55, BALATON Zoltan wrote:

Move the check for valid memory sizes from board to sdram contrller


controller


init. Board now only checks for additinal restrictions imposed by


additional


Thanks for finding these spelling mistakes, looks like I was in a hurry...


firmware then sdram init checks for valid sizes for SoC.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---
  hw/ppc/ppc440.h    |  4 ++--
  hw/ppc/ppc440_uc.c | 15 +++++++--------
  hw/ppc/sam460ex.c  | 32 +++++++++++++++++---------------
  3 files changed, 26 insertions(+), 25 deletions(-)

diff --git a/hw/ppc/ppc440.h b/hw/ppc/ppc440.h
index 7bd5cca1ab..29f6f14ed7 100644
--- a/hw/ppc/ppc440.h
+++ b/hw/ppc/ppc440.h
@@ -11,13 +11,13 @@
  #ifndef PPC440_H
  #define PPC440_H
  -#include "hw/ppc/ppc4xx.h"
+#include "hw/ppc/ppc.h"
    void ppc4xx_l2sram_init(CPUPPCState *env);
  void ppc4xx_cpr_init(CPUPPCState *env);
  void ppc4xx_sdr_init(CPUPPCState *env);
  void ppc440_sdram_init(CPUPPCState *env, int nbanks,
-                       Ppc4xxSdramBank ram_banks[]);
+                       MemoryRegion *ram);
  void ppc4xx_ahb_init(CPUPPCState *env);
  void ppc4xx_dma_init(CPUPPCState *env, int dcr_base);
  void ppc460ex_pcie_init(CPUPPCState *env);
diff --git a/hw/ppc/ppc440_uc.c b/hw/ppc/ppc440_uc.c
index b39c6dbbd2..e77d56225d 100644
--- a/hw/ppc/ppc440_uc.c
+++ b/hw/ppc/ppc440_uc.c
@@ -486,7 +486,7 @@ void ppc4xx_sdr_init(CPUPPCState *env)
  typedef struct ppc440_sdram_t {
      uint32_t addr;
      uint32_t mcopt2;
-    int nbanks;
+ int nbanks; /* Banks to use from the 4, e.g. when board has less slots */ 
      Ppc4xxSdramBank bank[4];
  } ppc440_sdram_t;
  @@ -728,18 +728,17 @@ static void sdram_ddr2_reset(void *opaque)
  }
    void ppc440_sdram_init(CPUPPCState *env, int nbanks,
-                       Ppc4xxSdramBank ram_banks[])
+                       MemoryRegion *ram)
  {
      ppc440_sdram_t *s;
-    int i;
+    const ram_addr_t valid_bank_sizes[] = {
+ 4 * GiB, 2 * GiB, 1 * GiB, 512 * MiB, 256 * MiB, 128 * MiB, 64 * MiB, 
+        32 * MiB, 16 * MiB, 8 * MiB, 0
+    };
        s = g_malloc0(sizeof(*s));
      s->nbanks = nbanks;
-    for (i = 0; i < nbanks; i++) {
-        s->bank[i].ram = ram_banks[i].ram;
-        s->bank[i].base = ram_banks[i].base;
-        s->bank[i].size = ram_banks[i].size;
-    }
+    ppc4xx_sdram_banks(ram, s->nbanks, s->bank, valid_bank_sizes);
      qemu_register_reset(&sdram_ddr2_reset, s);
      ppc_dcr_register(env, SDRAM0_CFGADDR,
                       s, &sdram_ddr2_dcr_read, &sdram_ddr2_dcr_write);
diff --git a/hw/ppc/sam460ex.c b/hw/ppc/sam460ex.c
index dac329d482..9b850808a3 100644
--- a/hw/ppc/sam460ex.c
+++ b/hw/ppc/sam460ex.c
@@ -74,13 +74,6 @@
  #define EBC_FREQ 115000000
  #define UART_FREQ 11059200
-/* The SoC could also handle 4 GiB but firmware does not work with that. */ 
-/* Maybe it overflows a signed 32 bit number somewhere? */
-static const ram_addr_t ppc460ex_sdram_bank_sizes[] = {
-    2 * GiB, 1 * GiB, 512 * MiB, 256 * MiB, 128 * MiB, 64 * MiB,
-    32 * MiB, 0
-};
-
  struct boot_info {
      uint32_t dt_base;
      uint32_t dt_size;
@@ -273,7 +266,6 @@ static void sam460ex_init(MachineState *machine)
  {
      MemoryRegion *address_space_mem = get_system_memory();
      MemoryRegion *isa = g_new(MemoryRegion, 1);
-    Ppc4xxSdramBank *ram_banks = g_new0(Ppc4xxSdramBank, 1);
      MemoryRegion *l2cache_ram = g_new(MemoryRegion, 1);
      DeviceState *uic[4];
      int i;
@@ -340,12 +332,22 @@ static void sam460ex_init(MachineState *machine)
      }
        /* SDRAM controller */
-    /* put all RAM on first bank because board has one slot
-     * and firmware only checks that */
- ppc4xx_sdram_banks(machine->ram, 1, ram_banks, ppc460ex_sdram_bank_sizes); 
-
+ /* The SoC could also handle 4 GiB but firmware does not work with that. */ 
+    if (machine->ram_size > 2 * GiB) {
+        error_report("Memory over 2 GiB is not supported");
+        exit(1);
+    }
+    /* Firmware needs at least 64 MiB */
+    if (machine->ram_size < 64 * MiB) {
+        error_report("Memory below 64 MiB is not supported");
+        exit(1);
+    }



These checks on the RAM size should be done by the SDRAM model.

May be it is addressed later in the patchset ?
No, these are really board specific as the commenst say, they are imposed by board firmware (as firmware fails with other valid RAM sizes for the SoC) that's why these are here and the SoC size limits are checked in the SDRAM controller model. 

Regards,
BALATON Zoltan


C.




+    /*
+     * Put all RAM on first bank because board has one slot
+     * and firmware only checks that
+     */
+    ppc440_sdram_init(env, 1, machine->ram);
      /* FIXME: does 460EX have ECC interrupts? */
-    ppc440_sdram_init(env, 1, ram_banks);
      /* Enable SDRAM memory regions as we may boot without firmware */
      if (ppc_dcr_write(env->dcr_env, SDRAM0_CFGADDR, 0x21) ||
          ppc_dcr_write(env->dcr_env, SDRAM0_CFGDATA, 0x08000000)) {
@@ -358,8 +360,8 @@ static void sam460ex_init(MachineState *machine)
                                 qdev_get_gpio_in(uic[0], 2));
      i2c = PPC4xx_I2C(dev)->bus;
      /* SPD EEPROM on RAM module */
-    spd_data = spd_data_generate(ram_banks->size < 128 * MiB ? DDR : DDR2,
-                                 ram_banks->size);
+ spd_data = spd_data_generate(machine->ram_size < 128 * MiB ? DDR : DDR2, 
+                                 machine->ram_size);
      spd_data[20] = 4; /* SO-DIMM module */
      smbus_eeprom_init_one(i2c, 0x50, spd_data);
      /* RTC */
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